Because that is when ppl started going in dif places in the world ensted of staying with there own races
A state can be defined as a 'political community' which gathers under one leader and abide by a specfic set of rules and laws.
The early states as those seen in the Sumer, where city-states. Small in size, ruled by a king with the support of the local people and land lords.
The ruler also had a small army to maintain local order and to protect against foriegn invasions.
Border ruffians contributed to the "bleeding Kansas" problem by actively terrorizing citizens of the free state. The Border ruffians came from the slave state of Missouri and in an attempt to change attitudes through force, they would actively terrorize opponents to their pro-slavery stance. The "bleeding Kansas" problem occurred as is was decided around the time of 1950 that the settlers themselves would choose whether Kansas was a free or slave state. This resulted in a flood of people from both sides rushing to settle Kansas in order to gain another state that aligned with their particular values. The period lasted until about 1959-60 and animosity persisted through the civil war.
Contain communism. In other words the same policy as containment.
The answer would be C. the Great Plains