The <a href="https://en.wikipedia.org/wiki/Webster–Ashburton_Treaty" id="mwXQ" rel="mw:WikiLink" title="Webster–Ashburton Treaty">Webster–Ashburton Treaty</a> is signed, establishing the United States–Canada border east of the <a href="https://en.wikipedia.org/wiki/Rocky_Mountains" id="mwXg" rel="mw:WikiLink" title="Rocky Mountains">Rocky Mountains</a>.