In the 1920s, the continued rise in the stock market and economic growth depended most on bankers buying stocks with cash.
investors buying stocks with cash.
consumers buying goods on credit.
consumers growing their own food.

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.

frederick william of brandenburg-prussia trained his son, frederick, to be a hardy soldier. but frederick disliked rifle shooting and horseback riding. unlike his father, he was interested in french literature. he enjoyed poetry and music and, like some others of the enlightenment, he scoffed at religion. his father thought him soft, frivolous and unmindful of his duties. and when frederick refused to put his signature on a right to succession, for a few moments his father strangled him.

are you asking for our opinion?

i believe it's that they cared for people. hope this ! : )