What was the purpose of the treaty of fort laramie? to keep native americans away from migration routes used by westward settlers to prevent the plains indians from engaging in wars over buffalo herds to protect american traders and trappers from competition by native americans to guarantee the safety of the mormon communities in the rockies

A) to keep Native Americans away from migration routes used by westward settlers.

Explanation:

In the spring of 1868 a conference was held at Fort Laramie, in present day Wyoming, that resulted in a treaty with the Sioux. This treaty was to bring peace between the whites and the Sioux who agreed to settle within the Black Hills reservation in the Dakota Territory.

explanation:

there are two statements that are incorrect.

1. the marshall plan was a lend lease program. it was an economic plan that europe redevelop itself after wwii.

2. einstein didn't really do anything to further the allied cause in building the bomb. he merely sent a letter to fdr telling him (in 1939) that if the united states entered the war, perhaps it would be wise to build the bomb before germany did. i would say this answer is incorrect, but when america entered the war 2 years later, fdr thought it might be a good idea to take einstein's advice.

the 4th choice is definitely so wrong that is likely the single answer of this question

theodore roosevelt challenged william to a duel, whoever won, got their policy sent to congress. it ended up in a stalemate, and both men were injured and sent to the hospital.