This is true and the after-dinner speeches did develop in England
during that time and their purpose was mainly to entertain or to state something
important but in humorous way. Any topic could discussed if it was approached
humorously and even though its main purpose was to entertain it could also be a
bit informational and persuasive.
The 1920s was a decade of lots social changes. The most obvious signals of change were the rise of a consumer-oriented economy and of mass entertainment, which helped to bring about a "revolution in morals and manners." Sexual mores, gender roles, hair styles, and dress all changed profoundly during the 1920s.
Most noticeably would be the insane developments in organized crime, as so many people illegally went to and created speakeasies.
It the was the only way they could pay for the damages from the war
By taking over the new land. They thought people weren’t there so they made it their own. (Native Americans were there)