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 Menorca and Trinidad were occupied. In 1800, the Spanish returned Louisiana to France, which had been given to them in compensation for their losses at the end of the Seven Years' War. The Portuguese, who opposed the French, continued to trade with the British in spite of a series of French demands that they close their ports to British ships. In 1801, the Spanish delivered an ultimatum on behalf of France, and in the following border war, occupied the town of Olivenza (Olivença) before the Portuguese agreed to the Spanish and French demands. The town – which is disputed to