The document summarizes major events and developments in the United States between 1945-1980, including the following:
1) Détente occurred under Nixon's presidency, resulting in the SALT I Treaty which sought to limit nuclear weapons between the US and Soviet Union.
2) Eisenhower's National Highway Act created the interstate highway system to improve transportation infrastructure.
3) The US increased its involvement in Vietnam through the Gulf of Tonkin Resolution and pursued counterinsurgency strategies, but faced difficulties due to the nature of the conflict.
4) The Vietnam War was highly controversial and protests intensified over the course of the 1960s as casualties mounted and support declined.