The site is called Cahokia Mounds.
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July 1st, 1970
I would guess that American culture is more diverse today, as at least some of the Native populations have retained their culture to this day and there are local enclaves of the culture of probably every country in the world also present in the US today.
Ordinance of 1787
The first U.S. coal labor union appeared in Illinois in the 1890s. By 1900 unions were present in five other states. Eventually, the United Mine Workers of America (UMW), a national organization, became the dominant labor influence in the industry.
The river flowing between Washington and Oregon is the Columbia River.