During Eisenhower's term the vast bulk of the rest of the planet was just getting caught up from having their industries pounded with high explosives for six years. America had established a huge advantage in technology that they would ride until the end of the Apollo program. American industry was rebuilding the planet and had enormous overseas markets to sell to with no competition from places like Japan and Germany (still smouldering). Comparing that era to this one is apples and oranges.
And we have to remember that during the Eisenhower era, resource levels were relatively high per capita and unions had many more members per capita. That combination led to a relatively wealthy and stable middle class, along with some other factor of course.
What we have been seeing is a gradual deterioration of the middle class especially, and this has been a gradual process that pretty much started in the late 1970's/early 1980's. Many states went after unions to weaken them, plus resources are getting harder and harder to find and their relative costs are going up, although not uniformly.
I've been saying for the last two decades now that we are going in the direction of becoming a "banana republic" (although "potato republic" may be more appropriate), with a wider disparity of wealth and more relative income being concentrated at the top, which was and is what we've seen with most countries to our south. This is a highly unstable situation if it continues, and the likelihood is that it will.
If we continue along this path and don't make intelligent economic and political adjustments, we're in for trouble. However, those with "privilege" will be a heavy wall of resistance because "money talks...", and we know how then end of that goes. The rather notable British anthropologist, Desmond Morris ("The Naked Ape"), in a 1970 or so interview, predicted this happening to us, and said he was worried because Americans, he said, don't know when to stop competing, and therefore we need to start spending more effort on cooperating with each other. If we don't, this could well tear us apart in the future.