in 1972, nixon became the first us president to

a. officially recognize the soviet union.
b. withdraw official us recognition of china.
c. visit china while in office.
d. initiate a cold war with communist nations.

  C. Visit China while in office.

Explanation:

  It was an important diplomatic and strategic overture to normalize the relations between the United States and China. It was the first visit of a United States´s President to the PRC who, by that time, considered America as enemies. The visit ended 25 years of no communications between the two countries.

  Nixon visited China to gain more leverage over relations with the Soviet Union in the context of the Cold War.

  I hope this answer helps you.

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).