Here are the answers to your questions:
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Which area did the United States acquire in 1846 after negotiations with Great Britain?
- The area acquired was the Oregon Territory.
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Which effect did the Treaty of Guadalupe Hidalgo have on the United States?
- It increased the debate over slavery.
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Which of these best completes the diagram?
- The best completion for the diagram is Texas.
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Which event was one cause of the U.S.-Mexican War?
- The cause was that U.S. and Mexican soldiers fought over disputed territory north of the Rio Grande.
Let me know if you need any further assistance!