Short answers, pulled from the story.
The Western Bloc was an unofficial coalition of countries allied with the United States during the Cold War, which lasted from 1947 to 1991. It was anchored by NATO member states in Western Europe and North America but also included allied nations across Asia, Latin America, Africa, and the Middle East. It was opposed to the Soviet-led Eastern Bloc and generally embraced capitalism, liberal democracy, and anti-communism.
The Western Bloc was also called the Capitalist Bloc, the Freedom Bloc, the Free Bloc, and the American Bloc. The term "Free World" was most commonly used in U.S. and allied political rhetoric, while "First World" was the geopolitical classification contrasting it with Soviet-aligned Second World states and non-aligned Third World nations.
The Truman Doctrine was announced by U.S. President Harry S. Truman in March 1947, pledging military and economic assistance to nations threatened by communist subversion, starting with Greece and Turkey. It formalized the U.S. strategy of containment and served as the political foundation of the Western Bloc's formation.
The Marshall Plan delivered over thirteen billion dollars in U.S. aid to Western Europe after it was enacted in April 1948; that figure is estimated at approximately one hundred and fifty billion dollars in present value. The program aimed both to rebuild war-devastated economies and to reduce the political appeal of communist parties, particularly in France and Italy.
NATO was founded on the 4th of April 1949, when twelve countries signed the North Atlantic Treaty. Article 5 of the treaty states that an attack on one member would be regarded as an attack on all, making collective defense the alliance's core principle.
The Western Bloc was criticized for backing authoritarian regimes that opposed communism, including those that came to power in Iran in 1953, Chile in 1973, and South Vietnam. Historians including Raymond Aron, John L. Gaddis, and Odd Arne Westad argued that anti-communism, rather than democratic principle, was the bloc's actual organizing logic, describing U.S. influence as a form of informal empire.