Historians have a difficult task, if not all facts have been discovered yet, with doing what?

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.

what are two things that greatly the american economy after the war? the huge buildup of u.s. military the beginning of the korean conflict the creation of the gi bill the marshall plan for nations