The Mesopotamians mathematical framework depended on products of 6 and 10. The first round of numbers depended on ten like ours, yet the following round depended on products of six to get 60 and 600.
One of the main ways in which migration patterns can affect other migrations is that when one large group of people moves to another area, this limits the amount of available resources in the area, and often forces the people who were there first to seek new land--thus forcing those new people off their land as well, in something of a never-ending cycle.
The fifteenth Amendment covers
the right to vote regardless of color. It did not allow states from denying any
citizen the right to vote on the grounds of race, color, or previous condition
as a slave. The African American men granted the right to vote.