C i believe i might be wrong
<span>Most historians believe early Native Americans crossed over the Bering Land Bridge from Asia to Alaska during the last Ice Age</span>
Availability of new land for farming in the West, while in the east, most of the land has already been taken.
<span>A very famous example for this was the Land Rushes - the races for the land that started in 1889 </span>
It would be John Locke, because the founding fathers believed in preserving the natural rights of man.