Sonora
... that the Mexican state of Sonora lost about half its territory in the mid-19th century to the United States?
... that the <a href="./Mexico" id="mwBmQ" rel="mw:WikiLink" title="Mexico">Mexican</a> state of <b id="mwBmU"><a href="./Sonora" id="mwBmY" rel="mw:WikiLink" title="Sonora">Sonora</a></b> lost about half its territory in the mid-19th century to the <a href="./United_States" id="mwBmc" rel="mw:WikiLink" title="United States">United States</a>?