"a. Immigration restrictions were expanded as fears of communist <span>infiltration from Soviet bloc nations spread" would be the best option from the list, since McCarthy instilled a feeling of paranoia about communism in the US.</span>
Originally the United States only had atomic weapons, but that all changed when in 1949 the U.S.S.R (or the Soviet Union) set off an atomic bomb, which started the Nuclear Arms race.
Hope this helps, have a BLESSED day! :-)
It is the second one.
Caesar became politically corrupt, which led Brutus to kill him.
It could be any of those but the best answer is the second one.
Answer: The geography and climate of each region made the colonies interdependent.