Which of the following stripped away Native American authority?

Indian Appropriations Act of 1851

Grant's "peace policy"

Indian Appropriations Act of 1871

Freedmen's Bureau

Indian Appropriations Act of 1871

Explanation:

In March 1871, Congress passed a law depriving Indian tribes of the right to be considered independent nations, relations with which were regulated on a contractual basis. Their new status was defined as wards of the United States, in respect of which Congress was entitled to issue any laws governing their lives and property. On this, the contractual period of Indian politics ended.