Answer:
The Louisiana Purchase significantly increased the size of the United States, which began the expansion of the country towards the West. It also laid the groundwork for the Civil War as the new territories took sides in the heated slavery debate.
The Louisiana Purchase covered a large area, from the Rocky Mountains to the Mississippi River, and it cost the U.S. $15 million. Native Americans were already living in the area at the time. However, much of the land was sold cheaply to pioneers for farming, opening up the country. It also eventually played a role in the start of the Civil War as the adding of new territories contributed to the struggle for control between the North and South. The addition of new states and territories, which were included in the attempt to make compromises on slavery, increased conflict and eventually led to war breaking out.
Explanation:

When did world war 1 start
Answer:
July 28, 1914 is the Correct Answer! :D
World War I, also known as the Great War, began in 1914 after the assassination of Archduke Franz Ferdinand of Austria
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Agricultural has changed social classes. For, example, trash has affected the upper class because of the amount of it keeps increasing, this also increases the difference between the high and low class.
In the case of Plessi v. Ferguson (1896), the U.S. Supreme Court ruled on the doctrine of Division, but the equality of citizens and which for half a century delayed the process of obtaining black citizens of the United States equal with white civil rights. This decision gave the legal basis for racial segregation in the USA, forcing black Americans to study in schools only for blacks, to use special, reserved for them public places.
"Out of the blue, the <span>cavalry comes to the rescue."</span>