Answer:
1844-1877 As the nation expanded and its population grew, regional tensions, especially over slavery, led to a civil war — the course and aftermath of which transformed American society. Key Concept 5.1: The United States became more connected with the world as it pursued an expansionist foreign policy in the Western Hemisphere.
Explanation:
slavery started the Civil war. problems between the north and south
Answer:
Gunpowder, compass, and water-powered clock.
Explanation:
These three items were most demandable in trade from China. These brilliant inventions are still used today. Hope this helps!