please answer —- Which of the following is an international issue facing the world and the United States in the 21st century? A. Communism B. The Cold War C. Free trade D. Human rights

The answer is -- (A) The Cold War.

Explanation: The Cold War was a period of geopolitical tension between the Soviet Union and the United States and their respective allies, the Eastern Bloc and the Western Bloc, after World War II. The period is generally considered to span the 1947 Truman Doctrine to the 1991 dissolution of the Soviet Union. Hope this helps!

i think it's a)sparta

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;