How did the Cold War change over time (1940s -1990s?

The period is generally considered to span The 1947 Truman Doctrine to the 1991 dissolution of the Soviet union. The term cold is used because there was no large scale fighting directly between the two superpowers, but day each supported major regional conflicts known as proxy wars

Both countries had to aprove annexation.

The social difference that caused sectionalism in the antebellum era would be c.)  north was disorganized. the north had slow population growth, where as the south had mass immigration.hope this really mark