Founded in 1919, El Mundo was a respected, conservative newspaper from Puerto Rico and was widely considered a key source for news until it ceased in 1990. The paper strived to live up to its slogan "Verdad y Justicia" (Truth and Justice). Key topics covered by the newspaper include industrialization of Puerto Rican society, the Great Depression, territorial relations with the United States including citizenship and activities of independence movements such as the Macheteros and FALN, the rise of the Popular Democratic Party, the Ponce massacre, the Ley de la Mordaza (Gag Law) and more.