Answer:
The Japanese attack on Pearl Harbor
The 1948 United States Presidential Election is considered apart from being one of the biggest electoral upsets in American history, the start of an era of great economic prosperity and growth of the United States as a superpower in the land of politics.
After winning the election then President elect Harry S. Truman implemented and oversaw various policies in order to contain and stop the influence of communism around the world which culminated in the entry of the United States in the Korean war.
During this time period President Truman also oversaw the approval of NSC 68, a secret statement of foreign policy. Which sought to increase the defense budget and in turn increase the military prowess of the US and weaken the Soviet Union's influence as much as possible.
The results of the 1948 Presidential Elections also influenced the reform of civil rights in the US, more specifically voting rights and fair employment rights, these reforms also had a key role in ending racial segregation in the armed forces.
The Cash and Carry Policy was all of the items purchased had to be paid with cash and then shipped from the United States on the buyers on personal ships. President Roosevelt got around the cash and carry requirement when Britain couldn't meet the terms anymore by creating the "Land-Lease Act." This allowed the United States to lend or lease arms to any country that was considered a vital asset to the defense of the United States.
Mexico has a temperate climate
