The <a href="https://en.wikipedia.org/wiki/Empire_of_Brazil" id="mwiQ" rel="mw:WikiLink" title="Empire of Brazil">Empire of Brazil</a>, <a href="https://en.wikipedia.org/wiki/Argentina" id="mwig" rel="mw:WikiLink" title="Argentina">Argentina</a>, and <a href="https://en.wikipedia.org/wiki/Uruguay" id="mwiw" rel="mw:WikiLink" title="Uruguay">Uruguay</a> sign the <a href="https://en.wikipedia.org/wiki/Treaty_of_the_Triple_Alliance" id="mwjA" rel="mw:WikiLink" title="Treaty of the Triple Alliance">Treaty of the Triple Alliance</a>.