Augustus Caesar contributed to the Roman Empire by: giving power back to the Senate and tribunes.
ruling as Rome's first emperor during the pax Romana
ordering the empire to expand to its largest size
dividing Roman citizens into plebeians and patricians.

ruling as rome's first emperor during the pax Romana

Explanation:

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering

answer:

it caused mass african migration, african populations to grow, african empires to topple, and racism against slaves to emerge.