Why is that Great Britain and France agreed with Hitler the cession of the Sudetenland?

They were appalled by the loss of life only a few years before and tried to avoid slaughter on a similar scale, unfortunately Czechoslovakia was sacrificed in the vain hope that Hitler's territorial ambitions would be quenched.

In every town and village in Britain and France there are memorials erected to the local men who died in WWI. At the Menin Gate in Ypres there is a memorial for the 90,000 British and Commonwealth troops who have no known grave - killed at the battle of Ypres, at Theipval in France there is another memorial to the dead with no known grave, there are 73,000 names on it - all British and Commonwealth troops who died at the Battle of the Somme.

Those 2 memorials contain the names of more war dead than the US lost in the war - and there are countless other cemeteries and memorials across Northern France and Belgium.

Britain lost nearly a million young men, France just over a million - an entire generation gone in four short years.

That is one of the main reasons for appeasement - fear of losing another generation so soon after the tragedy of WWI.

However, it did prove to be a poor policy because it led Hitler to believe that France & Britain would not stand up to him, regardless of his actions.

http://www.ukniwm.org.uk/

http://www.greatwar.co.uk/ypres-salient/memorial-m...

http://www.firstworldwar.com/today/thiepval.htm

They agreed because they were not prepared to go to war after the slaughter of the First World War, and neither France nor Britain were ready for a war at the time.

Because they were dumb enough to believe that Hitler would stop with the Sudetenland. He had promised that all he needed was the Sudetenland and he would be happy.

Chamberlain had no back-bone.