The developement of the British North American colonies and U.S. between 1607 and 1877?

Question

which force, westward expansion or north-south division, was a stronger factor shaping the developement of the British North American colonies and the United States between 1607 and 1877?

Answer 1

Greed as usual - greed for land, resources & wealth.

Answer 2

Westward expansion because it increased the size and population of the United States.