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
Enlightenment in Spain the United Kingdom and Austria, faced a decision: whether to continue to fight the Revolutionary France that had already defeated Spain once before, or to join the French side and hope for better times. The Spanish, after initially opposing the French, signed the Treaty of San Ildefonso in 1796, allying Spain to France, in exchange for French support for Charles IV's relations ruling the Italian duchy of Parma. In response, the British blockaded Spain in 1797 and separated her colonial empire from the mother country. By the end of 1798, the Spanish fleet had been defeated by the British, and