The interstate commerce act of 1887 required

Equality in shipping rates charged by railroads. (APEX)

the answer would be choice c, cave paintings.

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.