What does quindlen think unified america’s diverse ethnic groups before the end of the cold war?

She thinks that before the end of the Cold War America's diverse ethnic groups were held together by a common enemy.

Having a common enemy

Explanation:

Anna Quindlen, an American author, journalist, and opinion columnist, thinks and supports the idea that in order to unify any kind of social group they need to have something in common, in this case, America's ethnic groups have a common enemy before the end of the Cold War the everybody in the country got together to fight against communism.

onto a large boat, and mark the water level that the boat sinks to. then, take the elephant out and put a bunch of marked weights onto the boat until it reaches the same water level. add up the masses of the weights to get the weight of the elephant.