After World War II, the U.S. emerged as a major world power, largely in opposition to the U.S.S.R. and the Chinese Communist Party. Rather than all-out conflicts, what followed in the ensuing decades were a series of proxy wars. The first of these was the Korean conflict which was prompted by the People’s Democratic Republic of Korea (i.e. North Korea) illegally invading South Korea. The United Nations led a force to defend the territorial integrity of South Korea, comprised mostly of troops from the United States. While the borders changed and shifted, by 1953 the borders were settled roughly at the 38th parallel.
In the 1960s and 1970s, the United States was embroiled in the Vietnam War following an incident at the Gulf of Tonkin. This war became very unpopular, as the government of South Vietnam was noted for its corruption, U.S. involvement was crippled by politics, and soldier morale deteriorated. The Vietnam War was led by General William C. Westmoreland, a native of Spartanburg County, SC.
For folks in the United States, this period also saw an incredible amount of new technology as the result of military research and development. After the development of nuclear technology as part of the Manhattan Project, the American military was instrumental behind things we use every day, such as digital photography (1957), the first Internet (Arpanet, 1969), the first cell phone (1973), and GPS (1978).