Us influence began expanding in the 19th century, following Monroe Doctrine which defended Latin America countries from European influence in the same manner that is helped US shed off Britain. They later even engaged in help with troops and benefits, both in 19th, and 20th century, even now in the 21st.
Answer: its the decline in U.S. manufacturing jobs
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Your answer is c to your question
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False: President Polk obtained Oregon from Britain in order to allow the territorial threat of Great Britain to end in the Canadian area. He gained full ownership. He felt Oregon Territory should be divided along the 49th parallel.
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