How did the u. s. first try to end indian attacks on wagon trains which crossed the great plains? a. congress passed the removal act. b. the fort laramie treaty was negotiated. c. the u. s. forces blockaded indian tribes. d. congress passed the dawes act.

B. The Fort Laramie Treaty was negotiated.

Explanation:

The Treaty of Fort Laramiefue an agreement between the United States and the bands Oglala, Miniconjou, and Brulé of the Lakota, Yanktonai Dakota and the Arapaho Nation signed in 1868 at Fort Laramie in the Territory of Wyoming, which guarantees to the Lakota, property of Black Hills, land and hunting rights in South Dakota, Wyoming and Montana. The territory of the Powder River was going to be closed from now on to all the whites. The treaty ended the Red Cloud War.

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explanation:

to protest slavery i would think it would be a