Why were Native Americans moved onto smaller and smaller reservations in the 1850's?

a: white settlers wanted to establish farms on land already set aside for Native Americans?

b: white settlers wanted to hunt buffalo on land area set aside for Native Americans?

c: white settlers wanted to establish cities on lands already set aside for Native Americans?

d: white settlers discovered gold and silver in land already set aside for Native Americans?

a: white settlers wanted to establish farms on land already set aside for Native Americans?

Explanation:

The Indian Removal Act of 1830 was a law passed by the 21st Congress of the United States to facilitate the transfer of the Amerindian tribes who lived east of the Mississippi River from the United States to lands further west. The Transfer Law, which was part of the US policy known as Indian Removal, was ratified by law by President Andrew Jackson on May 28, 1830.

The Indian Removal or Indian Removal was a policy of the United States government in the nineteenth century that sought to move the Amerindian tribes (or "Native Americans") that lived in the east of the Mississippi River to land west of the river. During the decades that followed the War of the Independence of the United States, the rapid increase of the population of the country resulted in numerous treaties in which Native American lands were purchased. Finally, the government of the United States began to encourage the Indian tribes to sell their lands by offering them lands in the west, outside the borders of the then existing states of the country, where the tribes could settle again. This process was accelerated by the passage of the Forced Transfer of the Indians Act of 1830, which provided funds to President Andrew Jackson to carry out land exchange treaties ("relocation"). It is estimated that some 100,000 Amerindians were moved west as a result of this policy, most of them emigrating during the 1830s, settling in what was known as the Indian Territory.

Settlers wanted to take the Iindian land and build houses on it and basically establish a new "colony" on it so they told the indians it wasn't safe where they lived. so I'm thinking more of a