The Land Ordinance of 1785 affected slavery by stopping it from spreading.
spreading it throughout the nation.
abolishing it throughout the nation.
allowing enslaved people to settle in the West.

allowing enslaved people to settle in the west

Explanation:

i got it wrong and it said that was the right answer xD

i think it was because of how protected egyptian civilization was was which allowed them to evolve without much outside influence.

the answer is a, salt plain