1812. The United States and Canada have had a largely peaceful history. But sadly, during the war of that year the US forces invaded Canada.
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My answer would be B. To increase their chance of survival. It would be hard for the human race to survive on their own, there's strength in numbers.
C: the souths focus on growing cash crops led to the development of a slave labor force that was largely unknown north of maryland.
Answer:
president Theodore Roosevelt
