Amajor change in the balance of power within the 19th century europe was

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map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. for example, on a 1: 100000 scale map, 1cm on the map equals 1km on the ground.

answer:

it caused mass african migration, african populations to grow, african empires to topple, and racism against slaves to emerge.

1 wagon is the right answer