Describe a serious german act of aggression and the u. s. reaction. was this a good enough reason to enter the war? why or why not?

I assume this is WWI, well a German unit sank the passenger ship Lusitania which contained some 100 American citizens, which outraged the American public.

an interest group is an organization whose members share common concerns, and try to influence government policies that impact those concerns. elected officials frequently complain about the influence of "special interests" on american politics.