<a href="https://en.wikipedia.org/wiki/Mexican–American_War" id="mwXQ" rel="mw:WikiLink" title="Mexican–American War">Mexican–American War</a>: the <a href="https://en.wikipedia.org/wiki/Battle_of_Chapultepec" id="mwXg" rel="mw:WikiLink" title="Battle of Chapultepec">Battle of Chapultepec</a> begins.