After world war 1, the main reason britain and france did not support president wilson’s peace plan was that they

Wanted to punish Germany

France and Britain were destroyed by World War I and blamed Germany so they wanted them to pay for the war instead of focus on Wilson's plan for peace.

The 14 Points written by Wilson outlined a plan for peace and prevention of a future world war. Britain and France rejected the plan because it did not punish Germany for their part in the war. France and Britain put a plan in place which required Germany to take responsibility for the war, pay for war damages, and stripped them of their military power.