Question

How did the policy of appeasement affect France and Great Britain

Answer 1

It brought them harm because they expected Hitler to be satisfied and they believed that if they gave him what he wanted that he wouldn't cause a new war and wouldn't bother them. This is why they didn't prepare for what he did when he started the war and why France was defeated so fast and couldn't do anything about it and why England became locked out of Europe completely until the arrival of the Allies.

Answer 2

       The policy of appeasement in Britain and France in the 1930's was the expression of each countries naivete concerning threat. Appeasement allowed the British and French to ignore an imminent threat and produced a fake peace which led to many deaths.
       France and England hoped that Hitler would be satisfied with annexing Austria and conquering Czechoslovakia. Although they were suspicious, they hoped that Germany would not try to conquer then if it succeeded in his initial conquest. 
 Hope this helped and if you need more help then just message me instead :)