What has contributed to the economic development of the yucatan peninsula

How did the american revolutionary war change how some americans viewed the enslavement of african americans?

According to george washington, what was one reason a president should veto a bill?

In 1816, john c. calhoun proposed that: a. that the federal government aid in the construction of roads and canals to improve transportation to and from the west b. the united states should end slavery. c. the united states should increasing the size of the navy and invade central america. d. the united states should annex hawaii