The first meeting of Montezuma and Cortes was quite cordial. The Aztec ruler regarded Cortes with keen interest. He even received the gifts from the Mexican well. Cortes boldly put a necklace on the neck of the prince and even wanted to hug him if he did not thought it was going to be too much.
The action FDR want congress to take is shown on this image
The answer is navigation, date and time
After world war 1 the United States wanted to isolate themselves from things like that because of how bad the war was. They went as far as to not join the league of nations that their President made himself with other presidents. After the Korean War, they decided to not isolate themselves and meddle as much as possible to prevent the spread of communism because it would strengthen the Soviet Union who was the main enemy.