Why did britain and france end their policy of appeasement?

Britain and France were convinced to end their policy of appeasment when Hitler broke his promises from the Munich Conference and took over the rest of Czechoslavakia. They knew Hilter had to be stopped and declared war on Germany when Hitler invaded Poland.

Britain and France were convinced to end their policy of appeasement when Hitler broke his promises from the Munich Conference and took over the rest of Czechoslovakia. They knew Hitler had to be stopped and declared war on Germany when Hitler invaded Poland.