World War 1 & 2: Ben had interest in World War 1 and 2. He told me about his grandfather's positions he held in WWs 1 and 2; Ben highly respected his Grandpa . I admired Ben for his respect toward his heritage. On Brain-pop we watched how allied forces fought against Germany's Hitler. The United States entered WW 1 after the ship Lusitania was sunk by u-boats in 1915.