I've seen this expressed over and over on this thread and I just can't wrap my head around it. Are you really saying we've reached a point where the bottom 80% of the income distribution is something below middle class?
No, not saying that at all. "Middle class" in the US is a big range, and one that varies widely due to COL in different locations. I'm saying that an annual income of $100K is pretty much solidly middle class in any of them. Maybe not upper-middle in somewhere like Queens, and definitely not lower-middle in Little Rock, but it falls in that range. (And of course, the size of your household matters as well.)
I live in Missouri, as does Gumbo. In some areas here you can have a household income of $35K and still be solidly middle-class, provided your family is small, your home is paid-for and you don't have expensive tastes. The median household income where I now live is $32.7K... I'm in the top 5% here, but I'm at the bottom of it. Does that make me well-off? Yeah, probably. Does it make me wealthy? Hardly. When you look at the metro area instead of the city limits, I drop down into the top 25%, and that's what matters. Other than the cost of my home itself, all of my expenses are regionally priced. I'm not poor by any means (and I know, because I used to be poor; really poor), but I'm also not wealthy except by comparison to the poorest around me.
I agree with PrincessDaddy; in MOST of the US, $100K is unlikely to be enough to use to generate significant assets while still paying ordinary expenses, unless you have a unusual financial advantages to give you a leg-up, such as perhaps inheriting your home free and clear, or being an early beneficiary of a life-insurance policy.
Absolutely, if you are looking at global income numbers, probably 85% of Americans would qualify as wealthy. However, you can't put a roof over your head here on a family income of $3US/day, whereas in rural Bangladesh, you can, and manage to eat, too (not well, just vegetables and rice, but you can fill your children's bellies.) The definition of relative wealth differs geographically because the definition of poverty does as well.
If you are in the top 1% somewhere in the US where a sizeable chunk of the population is below the Federal poverty limit, you are still most likely not wealthy by US standards. Take the town where I grew up, for instance. According the the latest numbers, the median household income there is $20,165. (Not per-capita; household, and the average household size is 3.) The number of households classed as below the poverty line is 41.5%. The median home value is $75K. I know for a solid fact that there are 3 families in the area with assets that would make them truly wealthy, as in multiple millions, all of them own oil-rich land. There are 4300 households in that town, and I'd guess that today, perhaps 800 of them might break $100K in income. (And FTR, no civil servant makes anything close to that. School and police salaries both top out under $50K. The fire chief is probably the highest-paid city employee; he makes $62K.) Still, when you break out the income of the highest 1%, there is going to be a huge range there, all the way from about $160K to somewhere upward of $15M.