The <a href="https://en.wikipedia.org/wiki/Oregon_Treaty" id="mwtQ" rel="mw:WikiLink" title="Oregon Treaty">Oregon Treaty</a> extends the border between the United States and <a href="https://en.wikipedia.org/wiki/British_North_America" id="mwtg" rel="mw:WikiLink" title="British North America">British North America</a>, established by the <a href="https://en.wikipedia.org/wiki/Treaty_of_1818" id="mwtw" rel="mw:WikiLink" title="Treaty of 1818">Treaty of 1818</a>, westward to the Pacific Ocean.