The Indian Removal Act, passed in 1830, allowed the government to authorize the relocation of Native American tribes living east of the Mississippi River to lands west of the river, in exchange for their ancestral lands. This law primarily aimed to facilitate the westward expansion of settlers and was instrumental in the forced removal and displacement of thousands of Native Americans, leading to significant suffering and loss of life, notably during events such as the Trail of Tears. Therefore, the correct response is:
It let the government give land west of Mississippi to Native Americans in exchange for lands to the east.