Answer: Financial incentives from the government for new settlers in these regions, is the correct option.
The Indian removal act of the 1830s had already started the process of Indian removal from the southeast, The homestead act and financial incentives passed by the US government accelerated the westward movements of the new settlers. The homestead act was signed by Abraham Lincoln. According to the Homestead Act, the settlers had to pay a small to acquire the land and after five years they could get full ownership of the lands, and they could also purchase the land for less than two dollars per acre. By 1890, 80 Million acres of land were distributed under this act.