After Rojas' deposition, the Colombian Conservative Party and Colombian Liberal Party agreed to create the National Front, a coalition that would jointly govern the country. Under the deal, the presidency would alternate between conservatives and liberals every 4 years for 16 years; the two parties would have parity in all other elective offices. The National Front ended "La Violencia", and National Front administrations attempted to institute far-reaching social and economic reforms in cooperation with the Alliance for Progress. Despite the progress in certain sectors, many social and political problems continued, and guerrilla groups were formally created such as the FARC, the ELN and the M-19 to fight the government and political apparatus.