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
Catholic Church in French Louisiana Catholic Church in French Louisiana The Catholic Church in French Louisiana was ushered in with the establishment of colonies and forts in Detroit (1701), St. Louis, Mobile (1702), Biloxi, Baton Rouge, and New Orleans(1718). The French possessions of North America were under the authority of a single diocese, whose seat was in Quebec. The archbishop, named and remunerated by the king, was spiritual head of all New France. With loose religious supervision, the fervor of the population was very weak; Louisianans tended to practice their faith much less than their counterparts in France and Canada. The tithe, a tax by