Final answer:
The extreme drop in furs happened in 1774, and it led to the construction of inland trading posts. The British National Debt in 1763 mainly resulted from the French and Indian War. The abolition of the foreign slave trade in 1807 gave rise to a robust domestic slave trade.
Step-by-step explanation:
The extreme drop in furs, prompting the construction of inland posts, occurred in the year 1774. This decline in fur trade was in part due to overhunting, which caused fur-bearing animals to become scarce, as well as changing fashion trends in Europe.
Causes of British National Debt in 1763
The cause of the British National Debt in 1763 was primarily B. the French and Indian War. This conflict was part of the larger Seven Years' War and was very costly for Britain, leading to significant financial strain. The British government invested heavily in military expenses to secure victory, which contributed to the national debt.
The Abolition of the Foreign Slave Trade in 1807
The abolition of the foreign slave trade in 1807 led to B. the rise of a thriving domestic slave trade. The closure of the international trade routes did not diminish the demand for slave labor in American plantations. As a result, the domestic trade within the United States grew as traders turned to the internal markets to meet the continuing demand for enslaved people.