Explorer <a href="https://en.wikipedia.org/wiki/David_Thompson_(explorer)" id="mwvg" rel="mw:WikiLink" title="David Thompson (explorer)">David Thompson</a> posts a sign near what is now <a href="https://en.wikipedia.org/wiki/Sacajawea_State_Park" id="mwvw" rel="mw:WikiLink" title="Sacajawea State Park">Sacajawea State Park</a> in <a href="https://en.wikipedia.org/wiki/Washington_(state)" id="mwwA" rel="mw:WikiLink" title="Washington (state)">Washington state</a>, claiming the <a href="https://en.wikipedia.org/wiki/Columbia_District" id="mwwQ" rel="mw:WikiLink" title="Columbia District">Columbia District</a> for the United Kingdom.