Short answers, pulled from the story.
Holland is actually a region within the Netherlands comprising just two of its twelve provinces, North and South Holland, which together make up 38% of the Dutch population. The term became a shorthand for the entire country because of Holland's prominence during the Dutch Republic, the Eighty Years' War, and the Anglo-Dutch Wars in the 17th and 18th centuries. As of 2019, the Dutch government officially prefers the name Netherlands over Holland.
About 26% of the Netherlands lies below sea level, and 21% of its population lives in those areas. Most of the land below sea level consists of polders created through land reclamation that began in the 14th century. Without an elaborate network of dikes, canals, and pumping stations, these areas would be submerged.
The Netherlands legalised same-sex marriage in 2001, becoming the first country in the world to do so. The country also allowed women's suffrage in 1919 and has long maintained a tradition of social tolerance that includes legalised prostitution, euthanasia, and a liberal drug policy.
The Delta Works is a comprehensive system of dikes, barriers, and flood defences built along the Dutch coast after the North Sea flood of February 1953, which killed more than 1,800 people. Construction began in 1958 and the project was largely completed in 1997 with the Maeslantkering. It raises more than 3,000 km of outer sea-dikes and is counted among the seven wonders of the modern world by the American Society of Civil Engineers.
The Netherlands ranks second globally in the value of agricultural exports, behind only the United States, with exports worth 94.5 billion euros in 2019. This is driven by a highly mechanised farming sector, fertile soil, a mild climate, and intensive greenhouse agriculture. One-third of the world's exports of chilis, tomatoes, and cucumbers pass through the country, and the Netherlands exports two-thirds of the world's flower bulbs.
Germany invaded the Netherlands on the 10th of May 1940, and the Rotterdam Blitz forced most of the Dutch army to surrender quickly. During the occupation, over 100,000 Dutch Jews were transported to Nazi extermination camps and only a small number survived. More than 20,000 people died from starvation in the Dutch famine of 1944-1945, and the First Canadian Army liberated much of the country in 1944-45.