After the end of World War II, the period of the Cold War started; unlike the other war-torn economies of Europe and Asia, the USA emerged as a superpower. Events that led to the rising power of the USA were:
1) Right after the end of World War II, the USA began the Marshall Plan, which provided economic aid to rebuild Western European economies. This not only averted the spread of communism in Europe but also enhanced economic ties between the USA and Western Europe.
2) In the year 1949, NATO was formed as a military alliance to combat the threat posed by Soviet expansion. This further solidified the USA’s military.
3) USA landing a man on the moon in 1969, strengthened its status as a leader in science and technology as well.
4) when the Fall of the Berlin Wall took place in 1989, the influence of the soviet union also started to decline, and finally, in the year 1991, the Soviet Union collapsed, making the USA the sole superpower in the World.
5) Globalization further intensified the spread of American culture, ideas and political ideology later adopted by other countries.
There were other events also, like the Cuban missile crisis, the Vietnam War, and the Korean War, where the USA portrayed itself as a global hegemonic power.