Rivers, mountain ranges, historical points (railway, a wall, etc.)
Most country borders are divided by geographical points, and sometime just for political and historical reasons (what belonged, and waht should belong to whom).
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For Economic reasons. Areas farther out areas had land that was poor for farming.
Columbus's voyage will start the Columbian Exchange. This was a an exchange of fruits, vegetables, plants, and animals. Natives became introduced to many things that were not native to the Americas. Natives will be taken and sold into slavery and almost completely wiped out due to European diseases.
Answer:
i say meth and keep it moving
Explanation: