The primary cause of death among Native Americans during the colonial era was -
а
New World diseases
b
Old World diseases
с
enslavement
d
battles with white settlers

Option A

Explanation:

During the colonial era where Europeans started settling and colonizing all over the country brought many germs with them that they were immune too. Because of that fact "New world diseases" or option A such as: chicken pox, the flu, and malaria sweeping through the country at a alarming rate killing at least 90% of Native Americans in the country.

Hope this helps.

what the first or next guy says

i believe he was the 5th king of uruk. so c