In 1803 Robert Livingston and James Monroe were sent to France to negotiate the purchase of the Louisiana Purchase. Originally the two met set out only to purchase New Orleans and the surround territory, however, by the end they eventually purchased the massive track of land that extended beyond the Mississippi River which greatly expanded the size of the United States.
It was Zhu YuanZhang. Hope I helped Ya!
2009 it was recorded the immigration population was 38,512,234 now in 2018 their are around 44 million immigrants.