President Biden and key U.S. allies were in Normandy Thursday to commemorate the 80th anniversary of the U.S.-led allied forces' D-Day invasion of Nazi-occupied France. The brazen air and sea invasion would mark the beginning of the end of World War II, leading to the defeat of Adolf Hitler's Nazi German forces in Europe less than a year later. Mr. Biden, French President Emmanuel Macron, British Prime Minister Rishi Sunak and Canadian Prime Minister Justin Trudeau were together to mark the most significant victory of the Western allies in the war, as well as the largest seaborne invasion in history....