 In 1798 the US made this area part of the Mississippi Territory, after cessions from the states of Georgia and South Carolina.Between 1800 and 1812, European-American pioneers began to arrive, many with enslaved African-American laborers, and encroach on the lands of the Southeast Indian tribes.By the early 19th century, there were tensions among the Creek, with young men of the Upper Creek promoting a revival of religion and traditional culture, and the Lower Creek, more influenced by settlement and trade with European Americans in Georgia, becoming more assimilated.