Which of these was a reason for the United States engaging in imperialistic efforts after the Industrial Revolution in the U.S.? A. The U.S. wanted to reach out with humanitarian aid because of the good fortunes of a strong economy. B. The U.S. had experienced an industrial boom and needed to establish markets to trade these goods. C. The U.S. was developing an isolationist mentality because of all the warfare in the world.​

B-The U.S. had experienced an industrial boom and needed to establish markets to trade these goods.

Explanation:

There were several events that contributed to the fall of the Soviet Union. The most important ones ( with the dates included) are as follows:

December, 1979: Soviet troops invade Afghanistan to help the country's communist government to fight the guerrilla forces.January , 1981: Ronald Reagan becomes U.S. president. During his two terms he implemented a weapons policy that  the Soviet Union economy couldn't afford.March , 1985: Mikhail Gorbachev becomes president of the Soviet Union at 54 years old. He introduces glasnost (meaning openness) and perestroika (menaing reestructuring) in an effort to overcome economic and political problems.  February , 1989: The last Soviet soldier leaves Afghanistan. May , 1990: Boris Yeltsin is elected chairman of the Russian Soviet Federated Socialist Republic. (URSS) December , 1991: After surviving a coup, Mr. Gorbachev resigns as Soviet president, marking an end of the Soviet Union.