Answer:
World War I Germany's unfettered submarine warfare against American ships during World War I provoked the U.S. into abandoning the neutrality it had upheld for so many years. The country's resultant participation in World War I against the Central Powers marked its first major departure from isolationist policy.
Answer:
In the early 1800s, several semi-skilled trade unions formed – once again, Philadelphia unions played a major role - and factory strikes and walkouts became more common
Explanation:
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modifiying an organism naturalcharacteristics identical to its parent organism
