Well, it can't be the Cuban missile crisis, that was before he was president, he was the vicepresident.
the bombing of Japan happened about 20 years earlier.
He did sign the Civil Rights act into Federal Law, and that was very significant.
Answer:
The Truman Doctrine demonstrated that the United States would not return to ... both economically and militarily to contain the spread of communism around the world. ... One of the most pressing problems in the immediate aftermath of World War II ... in combatting the spread of communism: economic aid or military force?
Explanation:
Hot air goes up and the cold air goes down what the air currents forms when the atmosphere moves the excess hot air and warms the lower latitudes to the cooler air has high latitudes and so the air rushes in to replaces it. hopefully that help have a nice day :)