Explain why the Native Americans were excluded from the opportunities in America?

In 1830, the U.S. forced Native Americans to move west of the Mississippi to make room for U.S. expansion with the Indian Removal Act (Links to an external site.). Explain why the Native Americans were excluded from the opportunities in America? Please comment.
Please view The Cherokee Nation vs. Georgia 1832 (Links to an external site.) and comment. Please comment.
In the 19th century, the federal government began sending many Native American children to white boarding schools such facilities to assimilate them into mainstream white culture. The expansion of White Supremacy and the denial of Native American culture was an integral part of American culture. Why was their culture denied in America? Please comment.
Hidden History: Native American Boarding Schools
Please read 13 Issues Facing Native People Beyond Mascots And Casinos (Links to an external site.) and comment. A history of racism and exclusion has led to this. Please comment.