What were the 2 causes of World War 1 and the 2 reasons that the U. S. joined the war?

Main causes of WW1 were imperialism and militarism of great powers. The main reasons why United States entered the war was the sinking of ship Lusitania and the famous Zimmerman's affair.

Explanation:

At the beginning of 20th Century European powers were divided in two military alliances - Entente and Central Powers. Members of the second one believed that colonial possessions were not divided as they should have been. That is why most of countries, knowing that war is inevitable started strengthening their military. At the beginning United States tried to stay out of conflict, but after the sinking of ship that carried American citizens and a telegram from Germany to Mexico, where they asked for their involvement in the war against United States changed the attitude of US.

- "a new era of american politics began with jackson's election in 1828, but it also completed a grand social experiment begun by the american revolution. nevertheless, jacksonian democracy represented a provocative blending of the best and worst qualities of american society."

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answer: (fluidity)is the correct answer.

explanation: because of this characteristic, success on the battlefield depends in large part on the ability to adapt to proactively change events to our advantage as well as to react quickly to constantly changing conditions