The Second World War was caused mainly by Hitler's aims to unite German-speaking people, gain Lebensraum or living space, and dominate Europe and the world. Hitler rearmed Germany starting in 1932-1934 and used the new army to support Franco in the Spanish Civil War from 1936-1939. He then annexed Austria in 1938 and Czechoslovakia in 1939. The war involved over 60 countries across Europe, Africa, Asia, the Atlantic and Pacific oceans, lasted from 1939-1945, and was exceptionally brutal due to totalitarian regimes committing atrocities like genocide and concentration camps.