Which group used "biological warfare" in order to
expand their empire to the West?

You can look on Britannica for your

https://www.britannica.com/technology/biological-weapon/Biological-weapons-in-history

Explanation:

even if someone does vote because of your twitter status, there is no civic duty and would have been a more responsible citizen by not voting at all. voting should therefore not be viewed as a fulfillment of civic duty.

hope this : )

answer:

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