 Spain ceded the Florida Territory to the U.S., the U.S. gave fringe areas in the West to Spain, and the boundary was established between the U.S. and New Spain.The new boundary was to be the Sabine River north from the Gulf of Mexico to the 32nd parallel north, then due north to the Red River, west along the Red River to the 100th meridian west, due north to the Arkansas River, west to its headwaters, north to the 42nd parallel north, and finally west along that parallel to the Pacific Ocean.Informally this was called the "Step Boundary", although its step-like shape was not apparent for several decades.