The major factor is that they had different ideologies.
While the United States(US) believe in capitalism, where people should have freedom on their daily basis,such as trading,politics, and speech. It encouraged a free Market. While Soviet Union(USSR) took up communism, which controlled the general market and people do not have the freedom of speech and politics.
Both had the fear of the spread of one another's ideology especially US,was worried that communism would spread to the western Europe.Thus causing the tension and much suspicion between the two nations,leading to Cold War.
he delegates to the Constitutional Convention finally agreed the Three Fifths Compromise, that slaves should be counted at three fifths of their real number. The Three Fifths Compromise resolved the issue of counting slaves towards population in regards to representation in the House of Representatives.
It was stated that Japan would stop giving passports to people who wanted to immigrate to the United States in the 1907 Gentleman’s Agreement. This agreement was made because of the opposition to Asian immigrants.
President Roosevelt stepped in as he wished to have a good relation Japan due to Russia’s growing extension in East Asia.