Angry Wikipedia summary + ad hominem = educational content, apparently

Britain entered the war because Hitler had grand designs of ruling Europe (obviously). Britain and France guaranteed Poland protection from German invasion, despite this, and despite many warnings from Britain, Hitler invaded Poland anyway. This is a map of a planned invasion of Britain in 1940 by Hitler, the plan was called Operation Sealion. There were three aspects to the German invasion plan: the battle in the air, the battle at sea, and the amphibious assault on the British beaches. So Hitler did plan on invading and ruling over Britain as well. Just in case some historical revisionist idiot didn't know that.