Wilson hoped the League of Nations and disarmament would secure a lasting peace. Borrowing a thesis from H. G. Wells, he described the war as a "war to end all war". He was willing to side with France and the Britain to this end, despite their own militarism.
Fritz Fischer famously[27] put most of the blame on Germany's aristocratic leaders. He argued that the German leaders thought they were losing power and time was running out. The German social democratic party had won several elections, increasing their voting share and had by 1912 become the most represented party in Germany. While the elected institutions had little power compared with the Kaiser it was feared that some form of political revolution was imminent. Russia was in midst of a large scale military build-up and reform which was to be completed in 1916-17. A war would unite Germany and defeat Russia before this. In his later works Fischer went further and argued[28] that Germany had planned the war in 1912.
Historian Samuel R. Williamson has emphasized the role of Austria-Hungary. Convinced that Serbian nationalism and Russian Balkan ambitions were disintegrating a monarchy comprising eleven different nationalities, Austria-Hungary hoped for a limited war against Serbia and that the strong German support would force Russia to keep out of the war and weaken its Balkan prestige.
Balance of power
European military alliances prior to the war.One of the goals of the foreign policies of the Great Powers in the pre-war years was to maintain the 'Balance of Power' in Europe. This evolved into an elaborate network of secret and public alliances and agreements. For example, after the Franco-Prussian War (1870–71), Britain seemed to favour a strong Germany, as it helped to balance its traditional enemy, France. After Germany began its naval construction plans to rival that of Britain, this stance shifted. France, looking for an ally to balance the threat created by Germany, found it in Russia. Austria-Hungary, facing a threat from Russia, sought support from Germany.
When World War I broke out, these treaties only partially determined who entered the war on which side. Britain had treaties with France or Russia, entering the war on their side. Italy had a treaty with both Austria-Hungary and Germany, yet did not enter the war with them; Italy later sided with the Allies. Perhaps the most significant treaty of all was the initially defensive pact between Germany and Austria-Hungary, which Germany in 1909 extended by declaring that Germany was bound to stand with Austria-Hungary even if it had started the war.
Economic imperialism
Vladimir Lenin asserted that imperialism was responsible for the war. He drew upon the economic theories of Karl Marx and English economist John A. Hobson, who predicted that unlimited competition for expanding markets would lead to a global conflict.Lenin and others pointed out that the dominant economic position of Great Britain was threatened by the rapid rise of German industry; However, Germany did not have the commercial advantages of a major empire, and was therefore inevitably going to fight Britain for more economic space for German capital. This argument was popular in the wake of the war and assisted in the rise of Communism. Lenin argued that the banking interests of various capitalist-imperialist powers orchestrated the war.
Trade barriers
Cordell Hull, American Secretary of State under Franklin Roosevelt, believed that trade barriers were the root cause of both World War I and World War II. In 1944, he helped design the Bretton Woods Agreements to reduce trade barriers and eliminate what he saw as the cause of the conflicts.
Ethnic and political rivalries
A Balkan war between Austria-Hungary and Serbia was considered inevitable, as Austria-Hungary’s influence waned and the Pan-Slavic movement grew. The rise of ethnic nationalism coincided with the growth of Serbia, where anti-Austrian sentiment was perhaps most fervent. Austria-Hungary had occupied the former Ottoman province of Bosnia-Herzegovina, which had a large Serb population, in 1878. It was formally annexed by Austria-Hungary in 1908. Increasing nationalist sentiment also coincided with the decline of the Ottoman Empire. Russia supported the Pan-Slavic movement, motivated by ethnic and religious loyalties and a rivalry with Austria dating back to the Crimean War. Recent events such as the failed Russian-Austrian treaty and a century-old dream of a warm water port also motivated St. Petersburg.
Myriad other geopolitical motivations existed elsewhere as well, for example France's loss of Alsace and Lorraine in the Franco-Prussian War helped create a sentiment of irredentist revanchism in that country. France eventually allied itself with Russia, creating the likelihood of a two-front war for Germany.
