African Americans served mostly in support services during the Civil War. OA) This is true; they were mostly cooks and porters.
B) This is true; they took care of the horses and livestock.
C) This is false; they served mainly as spies.
D) This is false; 200,000 served in combat forces.

D i think

Explanation:

although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain