The origins of the Second World War (1939-45) may be traced back to the harsh peace settlement of the First World War (1914-18) and the economic crisis of the 1930s, while more immediate causes were the aggressive invasions of their neighbours by Germany, Italy, and Japan. A weak and divided Europe, an isolationist USA, and an opportunistic USSR were all intent on peace, but the policy of appeasement only delivered what everyone most feared: another long and terrible world war.