The Louisiana purchase in 1803, the Convention of 1818, the Adams-Onis Treaty in 1819, and the Webster Ashburton Treaty in 1842, all dealt with border disputes and land claims for the United States. The Louisiana purchase was the purchase of 828,000,000 square miles from France. This resulted in less border disputes with Spain because it gave The United States exact control over the Louisiana Territory. The Convention of 1818 was the meeting of Albert Gallatin from the United States, Richard Rush from France, and Frederick John Robinson from The United Kingdom to discuss a treaty pertaining to the Oregon Territory. The result of the treaty established the border between the United States and Canada at the 49th parallel N and allowed both sides to settle the Oregon Territory. Because both sides were allowed to settle the Oregon Territory there were many disputes between settlers of both countries. The Adams-Onis Treaty ceded Spanish Territory of Florida to the United States. It was considered a victory because it also settled the long-time border dispute between New Spain (Mexico) and Texas. Because of this the Spanish also did not have any access to Oregon Territory. In 1842 the Webster Ashburton treaty confirmed where several new United States borders would be after the Aroostook War, disputes among the Canadian border, and a dramatized need for border settlement. It agreed upon shared use of the Great Lakes, strengthened the Treaty of Paris (1783), and put a final end to the slave trade on the high seas. All four of these agreements were important because they changed the amount of land, local economies of regions, and created/settled disputes between the United States and other countries.