Tyler's Secretary of State, Daniel Webster, eager to settle the matter with England, had Tyler's full support and confidence. In 1842, the British dispatched emissary Lord Ashburton (Alexander Baring) to the United States. Soon, favorable negotiations were started.[118]
The negotiations culminated in the Webster–Ashburton Treaty, which determined the border between Maine and Canada.[118] That issue had caused tension between the U.S. and Britain for decades and had brought the two countries to the brink of war on several occasions. The treaty improved Anglo-American diplomatic relations.[119] To resolve the slave issue, the U.S. and England agreed to grant the "right to visit" when ships from both nations were suspected of holding slaves. Additionally, in a joint oceanic venture, a U.S. squadron, and the British fleet would cooperate and stop slave trafficking off of African waters.[120]
The issue of the Oregon border in the West was another matter and was attempted to be resolved during the negotiations of the Webster–Ashburton Treaty. At this time Britain and the United States shared Oregon by joint occupation, according to the Convention of 1818. 