It's simple
when 2 people marry , they have kids
those kids have their kids
then their kids and so on
so population increases
more detailed
Since most fertility occurs in marriage, a rise in the age of marriage can reduce world fertility. ... Later marriage means less female fertility exposed to intercourse, which can particularly affect already subfecund women. The number of women in professions and careers also dampens fertility rates.
The river north of the Colorado river is the Green River
And if u want to look for yourself just look at a map.
Fish and it was a new land. About 20000 people then to migrate there
upper Mississippi river is the answer
