Why, since the ear of the earliest societies, have population centers sprung up in coastal regions and river valleys?

The answer is: A. extreme population management policies

Extreme population management policies refers to unnatural actions that implemented by humans in order to radically change the number of population in a certain area.

Both Eugenics and genocide can be included in this category. Eugenics is a political measure to  promote a certain race to be 'inferior' and a certain race to be 'superior'. This influence citizen's dating preference and influence the number of children that were born from a certain race. Genocides is a mass killing of people from a certain race/ethnicity.

Answer:

The correct answer is D. The Louisiana Purchase, which doubled the size of the United States, is an example of a drastic boundary change.

Explanation:

At the Louisiana Purchase, the United States purchased more than 828,000 square miles of land from France in 1803. The total value of the transaction was of 15 million dollars or 80 million francs.

The territory of French Louisiana is much larger than the state of Louisiana in the United States today. From south to north, the territories include the shores of the Mississippi River in Louisiana (including New Orleans), Arkansas, Oklahoma, the northern border of Texas, the northeast corner of New Mexico, Missouri, Kansas, east of the Colorado, Iowa, Nebraska, most of Wyoming (east of the Rockies), west of the Mississippi River, Minnesota, south Dakota, most of North Dakota, most of Montana (except the western end), and the Missouri River Basin (also known as the southern border) in the Canadian provinces of Manitoba, Saskatchewan, and Alberta. The land area involved in the purchase of land is 22.3% of today's land in the United States, which is roughly equivalent to the original land area of ​​the United States at that time, thus doubling the territory of the United States at that time.

The Louisiana Purchase, which nearly doubled the size of the U.S., is an example of a drastic boundary change.

The Louisiana Purchase, which was an acquisition by the United States of approximately 828,000 square miles of territory from France in 1803, is an example of a drastic boundary change. This purchase nearly doubled the size of the U.S. and positioned the country for westward expansion. It led to significant shifts in power and reshaped the national identity of the U.S. It clearly was not a small boundary change or physical boundary shift. A stateless nation refers to an ethnic or cultural group that does not possess its own sovereign state, which is not applicable to the Louisiana Purchase situation.

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The Answer is:

B) Fight the Austrian Emperor