The motto of the United States is 'e pluribus unum', or 'from many, one'. Originally, this referred to the one union formed from the many states. It became the motto of the country because we had to fight a great civil war to prevent the manyness of the states from destroying the oneness of the union. What led manyness nearly to destroy oneness was the presence of slavery in many of the states. The diversity that tolerated the difference between slavery and freedom had become intolerable. A crisis had been reached in which, according to the greatest American, the house divided had to cease being divided. It had to become either all free or all slave.

Is Diversity Good? (2003)