Question

how did president john f. kennedy contribute to the international rivalries of the mid 20th century? he guided the u.s. into the korean war and hostilities with china. he issued the moon landing challenge that spurred on the space race. he demanded soviet withdrawal from germany, angering krushchev.

Explanation:

John F. Kennedy issued the moon - landing challenge in 1961. This was a significant move in the context of the Cold War. The Space Race was one of the major international rivalries (between the US and the Soviet Union) of the mid - 20th century. The Korean War was mainly under Truman's presidency, and while there were tensions with China, it was not the main contribution in terms of international rivalries as per the question. Demanding Soviet withdrawal from Germany was not a key contribution in the context of the major international rivalries (the Space Race was a more prominent and direct contribution to the Cold - War - era international rivalries).

Answer:

He issued the moon landing challenge that spurred on the Space Race.