Answer:
D. workers needed fewer skills and less training to do most factory jobs.
Explanation:
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Answer:
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A letter written during the time a historical event occurred would be considered a primary source, as opposed to secondary source, since it gives the point of view of someone who lived through the event in. I think
The United States wanted to make sure that the European
countries will not attack the United States. The doctrine stated that the US
will remain neutral in any foreign affairs. If any European countries will try
to colonize the US, they will consider it as an attack and may declare war
against the country involved.