The document discusses several topics in Colombian history and government: 1. Slavery was abolished in Colombia by law in 1851 during the government of José Hilario Lopez. 2. A constitutional amendment is a modification to some articles of the constitution itself, with changes that are milder than a full review. 3. The National Front was a political coalition between 1958-1974 that aimed to organize politics after a presidency, establishing equal power-sharing and rotating presidencies between the Liberal and Conservative parties.