How does the Constitution form a more perfect Union? In other words, what role does the Constitution play in uniting the states?

What would lead a historian to consider two events to have a relationship of correlation rather than causation

“well,” he says, “there’s excuse for picks and letting-on, in a case like this; if it warn’t so, i wouldn’t approve of it, nor i wouldn’t stand by and see the rules broke—because right is right, and wrong is wrong, and a body ain’t got no business doing wrong when he ain’t ignorant and knows better. it might answer for you to dig jim out with a pick, without any letting-on, because you don’t know no better; but it wouldn’t for me, because i do know better.” the meaning in this excerpt is

Which of these were effects of mass production techniques used during 1920s