As you’ve seen in this week’s resources, the end of World War II had far-reachin

As you’ve seen in this week’s resources, the end of World War II had far-reaching consequences for the United States and the rest of the world. The United States and the USSR became the two leading powers filling the leadership void left after the war. 
What were the causes of the Cold War? How did Truman’s reaction ensure U. S. national security? Consider and describe the ways these efforts, if any, contributed to the rise of McCarthyism.
Must be 200 words