During the neolithic revolution humans learning

In the neolithic era - meaning new era they learned many things.

Some may include use of communication. For example cuneiform writings (hummarabi's code)

Use of argriculture - like the ox plow

Ways of trading

Roles and duties to be used since they had a lot of food = surplus which leads to a growth in population then leads for people to how roles such as priests, farmers, slaves, kings, etc.

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.

they supported black codes so the answer is a or b