When addressing this question, there are two things that every history teacher is happy to see. The sinking of the Lusitania by the Germans was a spark along with the Zimmerman Telegraph by the Germans in an attempt to spark issues between Mexico an de the United States, this is when the United States joined the war. The most important moralist of all was President Woodrow Wilson—the man who dominated decision making so totally that the war has been labelled, from an American perspective, "Wilson's War". In 1917 Wilson won the support of most of the moralists by proclaiming "a war to make the world safe for democracy.
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It would be "party leadership" that is the most common party system in the world today, although it should be noted that there are still many unitary and dictatorship-based governments.
