Rise: How do the empires of Ghana,
Mali, and Songhai compare?
Rise:
Contributions:
Trade goods/natural resources:
Social structure:
Decline/fall:

they helped change culture. The trades became more efficient. Socially there were less wars, and fights among the empires.

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.

that would be the steamboat because none of the other things are forms of transportation