Establishing colonies in North America
colonies in the 16th century were seen as source of power and prestige. It is spain and Portugal that led the way,and their success and accumulation of wealth during that era made other european countries such as Great Britain and France to join.
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They fall out because the capital of the country was gone the government was in shock trying to recover.
The best option from the list would be that "<span>b. The United States began to build up its military and to stockpile weapons," since this was part of the inevitable "Arms Race" that took place between the US and the USSR. </span>
<span>The Truman Doctrine was a response to the growing influence of communism in Europe and Asia.</span>