<span>During the early 1960s, NASA’s Mercury program sent Americans into space.</span>
After the war, Kennedy represented the Massachusetts's 11th congressional district in the U.S. House of Representatives from 1947 to 1953. He was subsequently elected to the U.S. Senate and served as the junior Senator from Massachusetts from 1953 to 1960.
Technically this is true, since most of these men would spend the large majority of their time focussed on a specific subject, but there were of course exceptions.
Explanation:
After the build up of tension from Nationalism, Imperialism and Militarism, the Powers were worried about being attacked by each other. To counter this alliances were formed. ... The Alliance System was definitely a prominent cause of WWI. If Germany hadn't allied with Austria the war might've been averted.