Motives of the USA
World War 1 ended Nov 1st 1918 which was signed in a railway carriage, Northern France.
President Woodrow Wilson led American delegation.
Submitted the 14 points.
Woodrow Wilson President of the USA was the most lenient of 'the big three'.
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Summary
President Woodrow Wilson, was originally part of the "big four". He brought up the 14 points which were brilliant, although he could not convince his own people to agree with him.