What was held on may 1787 to discuss ways to improve the article of confederation

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.

Recently, there has been pressure to loosen clean air standards. use economic arguments to support or oppose this proposed action.

Stories that are passed down through generations by word of mouth are called