How was the US a main contributor to the tensions of the Cold War during 1945-1950?

Explanation:

Soldiers of the Soviet Union and the United States did not do battle directly during the Cold War. But the two superpowers continually antagonized each other through political maneuvering, military coalitions, espionage, propaganda, arms buildups, economic aid, and proxy wars between other nations.

mustafa ataturk thought nationalism in turkey would best be achieved by modernizing the country.

what are the reasons