Why did most american think the united states should extend to the pacific ocean?
a. they had already settled the lands of the great plains and needed more rooms.

b. they feared invasion by mexico

c. they wanted too make sure great britain did not claim the land

d. they believed out was their right to possess this land

The telegraph, the transatlantic telegraph cable, and the telephone were important to businesses after 1850 because of a. they created a system for developing new inventions. b. they filled a need that other inventions of the day could not. c. they attracted investors and created the stock market. d. they made picture-taking a popular american pastime.