In May 1915, the Lusitania was sank by a German U-Boat. About 1200 lives were lost, many hundreds of whom were American. Naturally, the Americans became angry that the Germans sank a ship full of passengers without provocation
The characteristic that distinguishes a federal system of government from both a unitary and a confederal system is dual sovereignty. Hope this helped!
D. Some powers are expressly given to the federal government under the constitution.
