The Land Act of 1820 established the ban on purchasing any of the United States' public domains in an installment or credit form of payment over four years. It actually just lowered the prices per acre but ended the credit or installment purchases.
The correct answer to this open question is the following.
Although there are no options attached we can say the following.
We are talking about the Battle of Little Bighorn.
It is correct that in this battle of June 1876, under orders from the US government to force the Native Americans onto reservations, federal troops entered the Little Bighorn Valley in Montana Territory. Although the troops were outnumbered, they attacked anyway.
The battle was a mistake and resulted in the defeat of the US Army.
The Battle of Little Bighorn resulted in a major defeat of the Calvary of the United States. The Arapaho Tribes, the Lakota, and the Cheyenne fight the 7th Cavalry Regiment led by Colonel George Custer. The Native American Indians had a superior number of men and they practically destroyed the US soldiers and Colonel Custer was killed on the battlefield.
