What is the significance of amending the constitution?

What are the 4 main reasons to provide information

Which statement is true of both presidential and parliamentary systems of government?

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