The French did not fully comply with the commerce provisions of the Treaty of Utrecht. They attempted to prevent English trade with remote Indian tribes, and they erected Fort Niagara in Iroquois territory. French settlements continued to grow on the Gulf Coast, with the settlement of New Orleans in 1718 and other (unsuccessful) attempts to expand into Spanish-controlled Texas and Florida. French trading networks penetrated the continent along the waterways feeding the Gulf of Mexico, renewing conflicts with both the British and the Spanish. Trading networks established in the Mississippi River watershed, including the Ohio River valley, also brought the French into more contact with British trading networks and colonial settlements that crossed the Appalachian Mountains. Conflicting claims over that territory eventually led to war in 1754, when the French and Indian War broke out.