There has been civil war in Colombia more or less continuously since 1948. It seems it may finally be coming to an end. It is ending the way most other long-lasting civil wars end. A changed geopolitical context combined with a deep sense of exhaustion on both sides is permitting an uncertain and imperfect compromise arrangement to prevail. This ending is comparable to similar endings in Northern Ireland and South Africa. It is what is not yet happening, and may not happen for quite a while yet, in Afghanistan, Syria, or Egypt.
Colombia's civil war started with the assassination of the Liberal Party's candidate for president, Jorge Eliecer Gaitán, who was thought likely to win the 1948 election. Colombia was at that time a largely agricultural, largely Catholic country. There were two mainstream political parties, the Colombian Liberal Party and the Colombian Conservative Party. The very names replicated a classic left-right split. They also reflected a classic split between freethinking and Catholic forces.
Over the next ten years, paramilitary forces linked to the two parties engaged in continuous fighting, particularly in rural areas, over control of the land. Captured soldiers were often killed in extremely cruel ways, especially by the Conservative party's forces. It resulted in at least 200,000 deaths and came to be known as "La Violencia." By 1958, the Conservatives had more or less won, and imposed a deal on the Liberals.
The restored calm did not last long. By 1964, a Marxist-Leninist political movement emerged from within the relatively small Colombian Communist Party to begin guerilla action against the mainstream. It took the name of the Fuerzas Armadas Revolucionarias de Colombia, or FARC. The early 1960's was a moment when similar movements were emerging in many Latin American countries. FARC turned out to be one that was able to survive a long time, until today in fact. Its ups and downs were many. The important thing is that it transformed the civil war into one that revolved around more fundamental divisions than the initial Liberal-Conservative confrontation. Indeed, the emergence of FARC seemed to bring the Liberals into a de facto coalition with the Conservatives to oppose the guerillas.
In the 1960s, the United States considered FARC as the kind of force they were fighting across the world and gave military and political support to the Colombian government. With the collapse of the Soviet Union, the United States turned its attention to what they considered to be a war on drugs. Here too, Colombia turned out to be crucial as a production and transit point for drugs, particularly cocaine. And after 9/11 in 2001, the United States (and other Western countries) labeled FARC a "terrorist" organization.
There was one serious attempt to end the war politically. In 1984 President Belisario Betancur entered into a pact with FARC, which allowed FARC to contest elections as the Unión Patriótica (UP). But so many of the UP's active leaders were assassinated by ultra-rightist forces as well as by state agents that the FARC members returned to being active guerillas by 1986. This sabotage of the pact by the far right has weighed in all subsequent negotiations.