The Mississippi Valley was very attractive for early colonizers. The Spaniards first went there in 1541, hoping they would find gold just like their fellow citizens had done in Mexico two decades earlier. But their venture didn't bear any fruit. Then, in 1673, French came to explore the land. Soon enough, missionaries followed their steps, and the first small settlements were formed, in spite of many troubles (such as outbreaks of smallpox).
It was a chain reaction. Long story short, the countries were pulled into the war because of agreements they had with their allies. This treaty is what caused the countries to enter WWI, to protect and defend their allied countries who were already in the war.
Muckrakers were the journalists who uncovered corruption in businesses and government.
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Provided places to fish and hunt. Also, because when the lands flooded it then became fertile.
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