Short answers, pulled from the story.
James Fearon defines a civil war as a violent conflict fought by organized groups aiming to seize power at the center or in a region. This definition requires that one side must be the state itself.
There were 213 civil wars from 1816 to 1997 when using the 1,000-casualties-per-year criterion. Of those conflicts, 104 occurred from 1944 to 1997.
A high proportion of primary commodities in national exports significantly increases the risk of conflict. A country with commodities comprising 32% of gross domestic product has a 22% risk of falling into civil war in a given five-year period.
On average a civil war with interstate intervention was 300% longer than those without. When intervention occurs on both sides the average civil war is longer by additional 92%.
The Spanish Civil War took place from 1936 to 1939. Germany, Italy, and Portugal supported opposition leader Francisco Franco while France and Soviet Union supported the government.