D-Day on June 6th, 1944 could be best described as

"a government in which power is divided between state and national levels". federalism is a system of government in which entities such and state and province, share power with the national government.

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)