The mountain ranges on Southeast Asia's mainland shaped the history of the region because the mountains separated the mainland from the rest of Asia and isolated early societies. The correct option among all the options given in the question is option "A".
Thomas Paine
wrote the pamphlet called common sense
The way that the 1862 Homestead Act helped pull immigrants to the United States is by providing immigrants with inexpensive farmland.
Many immigrants were drawn to the fact that they could own their own farmland, and not have to pay a lot for them. This is why a lot of these immigrants moved to the US.