CNN Editorial Research (CNN) — Here’s a look at Memorial Day, a day honoring American soldiers who died serving the country in wars. It is observed annually in the United States on the last Monday in May. Facts Several towns claim to be the originators of Memorial Day, but in 1966 Congress declared Waterloo, New York, to be the birthplace of the holiday. Memorial Day originally honored military personnel who died in the Civil War (1861-1865). Th…