Answer:
D. There was no more frontier land
Explanation:
This is the answer because the 1890 census said that the frontier region of the United States no longer existed which means there was no more frontier land.
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Ottoman sultan Mehmet II helped to strengthen the empire by :
Promoting religious divesity
This will bring loyalty from various group of people to the empire
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Answer:
Frederick Jackson Turner argued that overseas expansion was a "safety valve" to keep ambitious Americans content.
