He King Henery IV in 1076
Answer: number 1 is 8.5 million number 2 is 5.3 million number 3 is about 86 years
Explanation:
Do you have a specific civilization you are asking about? Or are we just implying on what we think makes best for a beginning of one?
I'm thinking it is syphilis. Syphilis is an STD, so it probably happened whenever the Europeans Enslaved the natives and did their way with them.
The ice age had a very negative affect on North America! Many people & animals died due to hunger and not enough of supplies. The land was completed frozen and the plants. Food was very hard to find!
I hope this helps you!!!