United Kingdom of Great Britain and Ireland

• 1. Introduction

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  The United Kingdom of Great Britain and Ireland was born on the 1st of January 1801, stitched together by the Acts of Union after a failed rebellion and a war with Revolutionary France had made the prospect of an independent Ireland seem, to British eyes, an existential threat. What followed was one of the most turbulent and consequential centuries any nation has ever lived through. A country that began the period with soldiers dying by the tens of thousands from tropical disease in French and Dutch colonies would end it scarred by nearly three million casualties from the First World War. How did a small island state come to dominate the world's oceans, finance the defeat of Napoleon, and oversee an empire stretching from India to South Africa? And how did a century of industrial triumph give way to the slow, painful unravelling that began with Irish hunger and ended with the partition of a kingdom?

• 2. Born from Fear and Fire

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  The Irish Rebellion of 1798 was the immediate trigger for union. It erupted while Britain was fighting Revolutionary France, and the Kingdom of Great Britain feared that an independent Ireland might throw its lot in with the enemy across the Channel. Legislation passed in the parliaments of both kingdoms formally merged them into one state at the start of 1801.

  The new union came with a broken promise. Irish leaders had been led to believe that union would bring Catholic emancipation, meaning the removal of civil disabilities pressing on Roman Catholics in both countries. King George III blocked that outcome. He believed that granting emancipation would violate his Coronation Oath to uphold the Protestant faith. His resistance forced Prime Minister William Pitt the Younger to resign. The promise that had made union politically palatable in Ireland was simply abandoned, and that wound would fester for more than a century.

  The early years of union were dominated not by domestic politics but by war. During the War of the Second Coalition, Britain occupied most French and Dutch overseas possessions, but tropical diseases killed more than forty thousand troops. When the Treaty of Amiens briefly paused the fighting, Britain agreed to return most of what it had seized. The peace was a ceasefire in all but name. Napoleon then attempted a trade embargo and occupied Hanover, the German duchy linked to the British Crown by personal union, and by May 1803 war had been declared again.

• 3. Waterloo and Its Aftermath

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  In 1805, a Royal Navy fleet under Nelson decisively defeated the combined French and Spanish navies at Trafalgar. That victory ended any serious prospect of a French naval challenge and was the last significant naval action of the Napoleonic Wars. Napoleon responded by issuing the Berlin Decrees in 1806, launching the Continental System: a deliberate attempt to strangle Britain by closing French-controlled Europe to foreign trade.

  The strategy failed. Britain held the greatest industrial capacity in the world, and its command of the seas let it trade freely with its possessions and with the United States. The Spanish uprising of 1808 gave Britain its foothold on the Continent, and the Duke of Wellington spent years pushing French forces back across the Iberian Peninsula. When Napoleon was driven back in the east by Prussian, Austrian, and Russian forces, Wellington invaded southern France from the south. Napoleon's surrender and exile to Elba seemed to settle everything, until he reappeared in 1815. Wellington and Gebhard Leberecht von Blücher defeated him once and for all at the Battle of Waterloo.

  The postwar years were harder than expected. Economic slump, poor harvests, and inflation bred social unrest. British leadership, deeply conservative and haunted by memories of the French Revolution, responded with repression. The suspension of Habeas Corpus in 1817 allowed the government to hold suspects without trial. The most notorious episode came on the 16th of August 1819 in Manchester, when a local militia charged into an orderly crowd of sixty thousand people gathered to demand parliamentary reform. Eleven died and hundreds were injured. The event became known as the Peterloo Massacre, and it has stood ever since as a symbol of the state treating peaceful protest as insurrection. The government's response was the Six Acts, which outlawed public meetings of more than fifty people and imposed heavy penalties on publications deemed seditious.

• 4. The Age of Reform

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  Catholic emancipation finally arrived in 1829, not as a gift but as a concession wrested from a frightened government. The Catholic Association in Ireland, led by Daniel O'Connell, had organised so effectively that Robert Peel warned Parliament in 1824 that a power co-ordinate with the government itself was rising alongside it. Wellington, the war hero and Tory prime minister, told Peel they faced civil war in Ireland if the association was not defused. Peel reversed his long-held position, and Catholic emancipation passed with Whig support.

  The same decade saw the Nonconformist Test Acts abolished in 1828, stripping away the requirement that government and university positions be held only by practising Anglicans. Then came the great Reform Act 1832. Charles Grey, 2nd Earl Grey, had been pushing parliamentary reform since the 1790s. The act he finally steered through Parliament sharply reduced the rotten and pocket boroughs where elections were controlled by powerful families, redistributed seats by population, and added two hundred and seventeen thousand voters to an electorate of four hundred and thirty-five thousand in England and Wales. Historian Richard Davis later concluded that the act deserved its old designation of "Great" as both a response to popular pressure and a turning point in the emergence of a more liberal political system.

  In 1833 Parliament abolished slavery throughout the Empire with the Slavery Abolition Act. The government purchased freedom for the enslaved by paying twenty million pounds to plantation owners, most of whom lived in England. The following year, King William IV was obliged to accept a prime minister who commanded a majority in Parliament, marking the effective end of Crown control over the cabinet. The repeal of the Corn Laws in 1846, driven by Richard Cobden and John Bright's Anti-Corn Law League, removed the tariffs on imported grain that had kept food prices high for the benefit of the landed gentry, opening the way for free trade to become Britain's governing economic principle.

• 5. Ireland and the Famine

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  In the 1840s, the potato crop failed in Ireland. Over one million people died from starvation and related causes. The British government did little to help the starving poor. Another million emigrated within a few short years, mostly to Britain and the United States, and the trend of emigration continued for decades afterward. Ireland's population has never recovered to its pre-famine level. The Irish language was almost wiped out.

  The famine was not experienced in Ireland as misfortune alone. Government inaction transformed it, in Irish memory, into evidence of deliberate neglect or worse. It became the foundation of a lasting resentment toward British rule and fuelled the growth of Irish nationalism that would not be resolved for another eighty years. The famine is remembered in Ireland to this day as oppression by the British Empire.

  The political consequences unfolded slowly but inexorably. Calls for Irish home rule grew through the second half of the nineteenth century and accelerated in the early twentieth. By 1910-1914, the Irish crisis was one of several simultaneous emergencies threatening to overwhelm British political institutions. Labour unrest, the women's suffrage movement, and constitutional battles over the House of Lords were all running at the same time. At one point it seemed the army might refuse orders relating to Ireland. The unexpected outbreak of the First World War in 1914 put domestic crises on hold but did not resolve them.

• 6. Empire at Its Height

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  From about 1830, London was the largest city in the world. After the defeat of France in the Revolutionary and Napoleonic Wars, Britain emerged as the principal naval power of the nineteenth century, with its dominance described as Pax Britannica. By the time of the Great Exhibition of 1851, Britain was called the workshop of the world.

  British India was by far the most important overseas possession. The Colonial Office and India Office managed their territories through small numbers of administrators, while local institutions developed alongside them. Beginning in earnest in the second half of the nineteenth century, Canada, Australia, New Zealand, Newfoundland, and South Africa became self-governing dominions, responsible for their own internal affairs while Britain retained control of foreign and trade policy.

  Free trade was the central instrument of informal empire. British financiers, merchants, and railway builders played major roles in the economies of most Latin American nations, operating successfully in countries that were never formally colonised. The second half of the nineteenth century brought a scramble for Africa among European powers. The Boer War of 1899-1902 pitted the British Empire against Dutch-descended settlers in southern Africa who fought a guerrilla war against a vastly better-equipped opponent. Britain eventually won, but the war was widely criticised for its human cost and methods. The Boer republics were merged with Cape Colony and Natal into the Union of South Africa in 1910, which had self-government internally but remained under British control for foreign policy.

  The rise of the German Empire after 1871 posed the first serious challenge to British naval supremacy. When Emperor William II discarded Bismarck in 1888 and began planning a rival navy, Britain responded by restoring relations with France, the United States, and Russia. A naval race with Germany replaced the non-alignment policy Britain had maintained for most of the century.

• 7. The Great War and Its Cost

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  Germany invaded France via Belgium in 1914. Britain had guaranteed Belgian neutrality, and its policies had all but committed it to defending France. War was declared. The romantic notions of warfare that all sides had expected dissolved quickly as the fighting bogged down into trench warfare along the Western Front.

  By early 1916, volunteer numbers were falling and the government imposed conscription in Britain, though it could not do so in Ireland where nationalists of every stripe opposed it militantly. The economy grew by roughly fourteen percent from 1914 to 1918 despite the loss of so many men to military service; the German economy shrank by twenty-seven percent over the same period. The government's share of GDP rose from eight percent in 1913 to thirty-eight percent in 1918. The Navy fought the Imperial German Navy to a draw at the Battle of Jutland in 1916 and maintained a blockade that left Germany increasingly short of food.

  After the United States entered the war in 1917, American troops arrived at the rate of ten thousand a day by May 1918. Germany agreed to an Armistice on the 11th of November 1918, surrendering its fleet and heavy weapons and retreating behind the Rhine. The almost three million British casualties were called the "lost generation." Siegfried Sassoon's poem Blighters was among the literary works that expressed the sense that their sacrifice was little regarded. The literary legacy that emerged focused on mechanised slaughter and deep disillusionment, and it permanently altered how war was understood in British culture.

  In domestic affairs, the Representation of the People Act 1918 gave women householders the vote, though full equal suffrage would not arrive until 1928. The Irish War of Independence followed the war and ended with British recognition of the Irish Free State in 1922. Six northeastern counties opted out of joining the Free State and remained part of the Union. On the 12th of April 1927, with the Royal and Parliamentary Titles Act, the state was formally renamed the United Kingdom of Great Britain and Northern Ireland.