What was an argument used by john l. o'sullivan to explain the idea of manifest destiny

What was the land like around rome? dry rocky fertile volcanic

Which of these played the biggest role in increased urbanization in the late 1800s? a) transportation improved b) the military was stronger c) no one was farming anymore d) steam power was discovered

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