Based on studies a person is 11 times more likely to be in an automobile accident or collision when they have reached the Blood Alcohol Concentration (BAC) of .08. This is considered the "legal limit" in the United States. Mothers Against Drunk Driving (MADD) helped to pass the legal limit of .08.
Okay, so, just from the top of my head, I think that it is because of the growing belief of "Manifest Destiny" in the nineteenth century. I'm not sure if this is the actual right answer for your question, but I do know that Manifest Destiny was in the nineteenth century and was the widely held belief in the USA that American settlers were destined to expand through out the continent. And I think both the USA and Europe wanted to expand, it was kind of a copetition/conflict they had. This was actually how Canada and Alaska came to be I believe. This was a simple explanation btw. cx
Farming greatly increased in the west
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i think trans-Atlantic Slave Trade im not sure tho
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