Colonial history of the United States Lower Louisiana. This vast tract was first settled at Mobile and Biloxi around 1700, and continued to grow when 7,000 French immigrants founded New Orleans in 1718. Settlement proceeded very slowly; New Orleans became an important port as the gateway to the Mississippi River, but there was little other economic development because the city lacked a prosperous hinterland. In 1763, Louisiana was ceded to Spain around New Orleans and west of the Mississippi River. In the 1780s, the western border of the newly independent United States stretched to the Mississippi River. The United States reached an agreement with Spain for
Kingdom of Etruria secure the Kingdom of Etruria as a client state for Spain; Louisiana was first ceded by France to Spain in 1763 at the end of the Seven Years' War. Louisiana was duly transferred to France on 15 October 1802, after the signing of the Treaty of Aranjuez. Napoleon subsequently sold Louisiana in the Louisiana Purchase on December 20, 1803, in order pay for his French armies during the War of the Third Coalition. The first king (Louis I) died young in 1803, and his underage son Charles Louis succeeded him. His mother, Maria Luisa of Spain, was appointed regent. However,