The United States was pretty much a wretched place to live prior to FDR for all except the extremely wealthy.
This is all relative, and a matter of opinion. When you account for how inflation has destroyed the middle class's purchasing power over the years, one could just as easily say the middle class is a wretched class to be in.
Today's middle class busts its ass at underpaying jobs, if they have one at all, to HOPEFULLY live better than paycheck to paycheck.
It would be more accurate to say flat wages in Real Dollars killed the Middle Class's purchasing power.
If you recall your history, the Carter years had the highest inflation rates in recent history, yet wages increased in Real Dollars. Please note that wages have gone down in constant dollars. Yet the US Economy has increased in Real Dollars,
Wages and Benefits: Real Wages (1976-2004)
Average Weekly Earnings (in 1982 constant dollars)
For all private nonfarm workers
1976 309.61 1.46%
1977 310.99 0.45%
1978 310.41 -0.19%
1979 298.87 -3.72%
1980 281.27 -5.89%
1981 277.35 -1.39%
1982 272.74 -1.66%
1983 277.50 1.75%
1984 279.22 0.62%
1985 276.23 -1.07%
1986 276.11 -0.04%
1987 272.88 -1.17%
1988 270.32 -0.94%
1989 267.27 -1.13%
1990 262.43 -1.81%
1991 258.34 -1.56%
1992 257.95 -0.15%
1993 258.12 0.07%
1994 259.97 0.72%
1995 258.43 -0.59%
1996 259.58 0.44%
1997 265.22 2.17%
1998 271.87 2.51%
1999 274.64 1.02%
2000 275.62 0.36%
2001 275.38 -0.09%
2002 278.91 1.28%
2003 279.94 0.37%
2004 277.57 -0.84%
Source: U.S. Bureau of Labor Statistics
http://www.workinglife.org/wiki/Wages+and+Benefits:+Real+Wages+(1964-2004)
Wouldn't be nice if US workers were rewarded for their hard work, like they used to be. But as the unions were weakened, the wages became flat despite high worker productivity.