Answer:
It was a breaking point for this sort of thing
Explanation:
Im going to compare this to the BLM movements, George Floyd was not the first Black person to be murdered by police brutality, but all the previous cases built up to this case and it was the breaking point. It's the same thing for this, Emmett Till was not the first but his case was the breaking point for stuff like that.
Hopefully this helps!
Answer -
The Truman Doctrine was basically a shot at the Soviet Communism and how it wasn't right, so this obviously angered the Soviets. The Doctrine caused a divide between the communists and non-communists, which did indeed grow tension between America and the Soviet Union which eventually would lead to the Cold War.
Louisiana Purchase - Jefferson
Alaska - Seward
Northwest Boundary - Poll
Red Cross - Barton
Airplane - Wright Brothers
Polio vaccine - Salk
USA, because that is were the Rocky Mountains are.
