Electricity in U.S.A. households (and not only there)

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Hello. I'm opening this subject because I do have some curiosities about electricity use in U.S.A. households (and not only there).
I do know that electricity is common in U.S.A. households use, for eg, not very much houses or apartaments are having gas for cooking or heating, electricity beeing more common.
Individual houses do have theyr own transformers on the electricity poles. And you can get 240 Volts for some bigger consumers (in Europe that would be 400 Volts today, 380 up untill the '000's, when they rised the voltage a little bit). Do some apartament buildings offer 3 phase current onto the apartament?
I got me the 2nd volume of a book about electricity use in U.S.A. Yes, the printed that in communist Romania, but it was not a book adressed to the general public. Got it from a 2nd hand book store not more then a mile away from me, a 2nd book store from which I got a lot of old books about electricity. In the book they are mentiong that electricity is cheap compared to the early days and so it's common in farms. The only time when electricity was cheap in Romania it was in the '60's and '70's, then restriction camed, then after communism, big prices. In the '60's? and '70's they even made electric cooking machines in Romania (such machines where sold in Romania in the '30's)... some where installed in apartament buildings whre gas wasn't avaible (yet). On a '30's magazine (again not destined to the general public - even if you could probably buy it - it was edited by the company that provided coal (town) gas and electricity in Bucharest) they sayed that refrigerators in U.S.A. could be found even in farms... in Europe they where luxury items and in Romania only the upper class could afford them. Refrigerators started to become more common in the '60's, but only in the late '60's they reallay becamed more common in cities (on the country side, in the '70's-'80's).
If you are intrested, you can ask me more about electricity use in Romania.