America feared what when the Soviet Union launched Sputnik 1 in 1957

WW3 after ww2 they still were angry of how ww2 ended

Explanation:

They feared several things but the biggest one was the fear of their everyday  lives being watched by the Soviets.

Explanation:

Take the movie Miracle the Americans are unnerved by the Russians when they come up in conversations.

alliances in ww1 were different from ww2 because the entente in ww1 made up of serbia,russia,france,britan,japan and italy later america  and all allied in a sort of balance of power and too keep germany,austria-hungary,and the ottomans down. russia allied the serbians in order to exert its influence in the balkans while france allied the russians because france was still in dismay and insulted after the defeat to the germans during the unification of germany and britian allied the belgians after the germans invasion of belgium.in ww2 the alliances were in a preemptive attempt to deter any further wars into happening while germany and italy allied since they were insulted and humiliated after the previous war while also sharing a similar ideology of facsim along with japan which all 3 had a want for world domination and agreed to assist one another in the endevours 

explanation: