Why did Woodrow Wilson receive the Nobel Peace Prize. Explain.

Woodrow Wilson was awarded the 1919 Nobel Peace Prize
because of his efforts to create a just peace after WWI and, as part of that, to set up
the League of Nations.  This is somewhat ironic because the Treaty of Versailles and the
League of Nations both failed.  The treaty helped lead to WWII and the League was never
very effective.

Wilson wanted WWI to be "the war to end all
wars."  He wanted to set up a system after the war that would ensure that countries
would no longer go to war with one another.  He had a famous plan, called The Fourteen
Points, that was meant to make this happen.  Wilson tried hard to get the Fourteen
Points incorporated into the Treaty of Versailles.  He was not altogether successful,
though.  He won the prize for these efforts, and particularly because he did succeed in
getting the League of Nations (very similar to the United Nations today) set
up.