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The Webster-Ashburton Treaty was a landmark agreement between the United States and Great Britain that was signed on August 9, 1842. The treaty resolved several long-standing issues between the two nations, including disputed boundaries, extradition of criminals, and the suppression of the slave trade.

One of the most significant agreements reached in the Webster-Ashburton Treaty was the settlement of the Maine-Canada border dispute. For years, both nations had claimed ownership of a large section of territory known as the Aroostook War, which had led to skirmishes and tensions between the two nations. Under the terms of the treaty, the border was redefined to follow the St. John River, which restored peace between the two nations.

Another important provision of the Webster-Ashburton Treaty was the extradition clause, which allowed both nations to extradite criminals who had fled to the other country. The treaty also established a joint commission to investigate and suppress the illegal slave trade, which had been a contentious issue between the two nations.

Overall, the Webster-Ashburton Treaty was a significant diplomatic achievement that helped to strengthen the relationship between the United States and Great Britain. By resolving long-standing issues and setting a framework for cooperation, the treaty laid the foundation for future trade and diplomatic relations between the two nations.