I'm not 100% sure on what the answer is but I think its either B or C.
D) it protects our nation
Answer:
1. Management of scientific methods
2. Progressive line
3. Speakeasy
Explanation:
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.
The different cultures were established in Asia and carried into the Americas. B. Constant warfare among the different Native American groups led to cultural differences.