World War 1 started in 1914 with Austria Hungary declaring war on Serbia. The war lasted until 1918 with the US joining the war in last year. War cost the lives of millions and many were wounded. The Allied powers won the war and ended the war with the treaty of Versailles . This demanded that Germany pay reparations for the war. Germany became the newly formed Wiemar Republic and did not know how to pay off their reparations.