They are examples of culture and ethnic deferences
The answer is A! Physical map, as it shows the height of things that are above or below sea level.
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A. The Europeans brought diseases like smallpox, and many Native Americans died.
People started moving towards the South in the second half of the 20th century mostly for economic reasons. Southern states had cheaper standards of living and you could find a home easier and a job. The expenses were not as high as they were in the northern countries, mostly those in the north eastern part of the US.