World War I, which lasted through Jul 28, 1914 to Nov 11, 1918.
https://www.history.com/topics/world-war-i/world-war-i-history
Info at the link
I would say the answer is C. Persons from varied backgrounds working together to try to do a job well.
I think it wasthe Britains but im not so sure.
wrong we were fighting nazis at world war ll and pearl harbor was from japan