Of course, the nuclear family of the 1950s had:
a 1200 (not 2200) sqft house,
formica (not granite) counters, ...
But the house was owned - with a mortgage affordable on a single income and substantial equity in place.
The car was also either owned or being purchased on an auto loan (rather than leased), again with substantial equity from the down payment, and again paid for out of that single income - which was also feeding and clothing the 2.3 children and taking a nontrivial vacation once a year or so.
And I have no idea where you are getting those square footage numbers. Our family's houses (we moved a couple times once Dad got done with his degree and was buying rather than living in a student ghetto) were substantially larger than you describe, and were typical of the neighborhoods around them.
Yes, Formica: It was the big deal of the time. Granite is a recent vanity - and a REALLY STUPID idea if you actually USE the kitchen to prepare food on a regular basis. Drop a ceramic or glass utensil on a granite counter and it breaks. Drop it on Formica-over-plywood-or-hardwood and it usually bounces.
stainless steel appliances,
*might* have had a TV (not a 54" LCD),
Yeah we had all those boxes (though the appliances were be enamel rather than stainless). Also a console sound system - pre "Hi Fi" - AM, FM, and four-speed record changeer with diamond needle in the pickup.
The non-electronic appliances lasted for decades, too. (Even the electronics lasted a long time with occasional maintenance - which was required for vacuum tube based equipment - and was AVAILABLE.) Quite unlike the modern stuff. (My own family has been in our townhouse for about 17 years now and is on its third set of "stainless steel appliances", thanks to the rotten construction of post-outsourcing equipment by formerly high-end manufacturers. We're even on our third WATER HEATER: The brain of the new, governent mandated, eco-friendly, replacement flaked out after less than a year - and the manufacturer sent TWO MORE defective replacement brains and one defective gas sensor before lemon-replacing it.)