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
France in the American Revolutionary War France and the U.S. was weakened. Thus the influence of France and Spain in future negotiations was limited. The war formally ended in September 1783 with the signing of the Treaty of Paris. France gained (or regained) territories in the Americas, Africa, and India. Losses in the 1763 Treaty of Paris and in the Treaty of Utrecht (1713) were in part regained: Tobago, Saint Lucia, the Senegal River area, as well as increased fishing rights in Terra Nova. Spain regained Florida and Minorca, but Gibraltar remained in the hands of the British. Because the French involvement in the war was