Oath of the Constitution of Buenos Aires Province at "Plaza de la Victoria" (current "Plaza de Mayo"). The photo was taken from the "Recova", a building located at the middle of the Plaza, where Defensa street is located nowadays.
<a href="https://en.wikipedia.org/wiki/Charles_DeForest_Fredericks" class="extiw" title="w:Charles DeForest Fredericks">Charles DeForest Fredricks (1823-1894)</a>
1854-05-23
Museo Histórico Nacional <br> (later reproduced on <i>La Fotografía en la Historia Argentina</i>, Tomo I, <i>Clarín</i>, 2005