It would be extremely difficult for historians to pinpoint one or two reasons for the cause of World War I since there were numerous issues,

It would be extremely difficult for historians to pinpoint one or two reasons for the cause of World War I since there were numerous issues, interests, and events that brought the world to war in 1914. Examine how and why the United States got involved.

What circumstances, events, motives, or problems brought the United States to war? 

Be sure to cite your references

include all refrence and dates.