The Spanish Civil War (1936-1939) was a military and political struggle between Left and Rightwing factions in Spain. Despite the likelihood the Spanish Civil War would lead to a larger war in Europe, pro-democracy countries chartered a course of nonintervention and isolationism. It remains one of the most controversial periods in the Twentieth Century as it is often described as the dress rehearsal for World War II. First, this research paper will review the complex political environment in Spain before the war resulting in the outbreak of the Civil War. The second part of this paper will focus on the international political environment and the effects it had on the Spanish Civil War. It will evaluate foreign policies and the strategic-level relationships between Spain, Britain, France, the USSR, the United States, Germany, and Italy. Finally, the paper will conclude with some lessons learned from the War