Question

In the 1890s, growing frustration and resentment among the Plains Indians led to ?American Indians embracing the concept of assimilation.
American Indians joining the Ghost Dance movement
. hostilities between American Indians and the Colorado militia.
a new treaty between the federal government and tribal leaders.

Answer 1

I believe the answer you're looking for is "American Indians joining the Ghost Dance movement". The year is close to the events of mass killings like Wounded Knee.

Answer 2

The correct answer is "hostilities between American Indians and the Colorado militia."

The Wounded Knee Massacre, which occurred in 1890, was a confrontation between Native Americans who belonged to the Minincojou and the Hunkpapa Lakotas and the Colorado Militia, led by Colonel James Forsyth.

As a result of this battle, nearly 300 Native Americans and 25 American soldiers died. In 1990, the US Congress passed a resolution expressing a "deep regret" for the massacre.