大约就是在1948年到1973年这一阶段，社会学家们开始发现，大部分美国人开始将自己定位为中产阶级而不是工人阶级了。
It was during this era – roughly from 1948 to 1973 – that sociologists found that a majority of Americans had come to define themselves not as working class, but as middle class.