1. Management of scientific methods: after the WW1, some improvement were made in regards to scientific techniques and innovations. Some new weapons were created as a result of this improvement.
2. Progressive line: this has to do with improvement in manufacturing processes in which parts are lined as semi- finished items.
3. Speakeasy: these are legal establishment after the WW1 where people tend to go to ease themselves like pubs, bars and clubs.
federal is central, parliament can be either, but confederacy states that the states involved are fully separate but in union, do the answer is confederacy