How did the Appeasement Policy used by the French and the British contribute the cause of World War II?

Appeasement emboldened Hitler's Germany, essentially leading to WWII. As Hitler continued to invade territories and build a military capable of fighting a major war—despite the Treaty of Versailles—Britain and France allowed him to continue, hoping he would leave them alone if they left him alone.

Explanation:

not to sure sdi, strategic defense initiative