►according to this document, why were slaves not considered to be
people?

I dont see a document but i think i can still answer your question. Slaves were not considered people because they were owned by people and considered property. Slaves did not have rights like others and were not accounted for until the 3/5 act. And even then only 3 out of 5 slaves were counted to up the population but still did not have rights.

answer: (fluidity)is the correct answer.

explanation: because of this characteristic, success on the battlefield depends in large part on the ability to adapt to proactively change events to our advantage as well as to react quickly to constantly changing conditions