A member of Congress introduces a bill into his or her legislative chamber. The president may sign the act of Congress into law, or he may veto it. Congress can then override the president's veto by a two-thirds vote of both the House and Senate thereby making the vetoed act a law.
Once congress agrees to the new law, it goes through the president. He decides where it is created or not. If he does not accept, it is vetoed. However, if 3/4 of Congress decides to pass the law after he vetoes it then it is passed.
President Woodrow Wilson is who dratted the 14th points for peach terms to end WWI, and his main objective was a statement for peace that was to be used for peace negotiations.