Which historical event is the best example of the breakdown of the constitutional system of federalism envisioned by Madison in Federalist No. 51

Which best describes why it is necessary to evaluate a solution?

Gettysburg address question. lincoln uses the images of birth and rebirth in this address. why?

How does specialization enable countries to trade with one another? a country can make and sell goods affordably and buy goods that it is inefficient at making. a country can make what it chooses and sell its goods to other countries. a country can decide to buy everything it needs from other countries. a country can efficiently make goods that were once difficult to make.