Gua·da·lupe Hi·dal·go (gwäd'l-ōōp' hĭ-däl'gō, gwä'dä-lōō'pě ē-däl'gō) A community of south-central Mexico, near Mexico City. The Virgin of Guadalupe, revered throughout Mexico, is said to have appeared to an Indian convert in this vicinity in 1531, and the basilica erected in her honor is a popular pilgrimage site. On February 2, 1848, a treaty ending the Mexican War was signed here.