Why did appeasement happen in 1938?

Hitler's appeasement was a policy of providing concessions to Nazi Germany and its leader Adolf Hitler by European powers Britain and France mainly. The appeasement policy had many reasons. The British army was not strong enough to challenge German military which had grown tremendously during Hitler's time. A general consensus was that Treaty of Versailles was unfair and global powers were willing to make up to Germany. British leadership believed that Hitler provided a defense against Soviet communism.