Normally you type rubbish here - but this time round you've outdone yourself.
Let forget about US for now - pick any contemporary Africa country - and show us who is electrifying at Kenya rate - you can try TZ,Rwanda, Ethiopia, Uganda or any country.US in 1930 was rich country - It was a super-power then - and what has size has to do with anything - if size was critical - why isn't Burundi or any small country not 100% electrified. US is big country with lots of people and lots of money. Size doesn't matter.
There has been no significant change of technology in stuff like building a house or supplying power or building a road - enough to change anything - it still as hard as it was to lay wires and poles - I don't know what technology you're talking about honestly - you may been totally out of reality - but ask around what entails supplying power? - still manual process that involve poles being trucked to be treated - trucked back - and manually digging up poles - pulling poles - and name it.
Talk about telcom or banking - and you have a point there.
Maybe tech has improved so significantly the last 10yrs - because btw 1900-2006 - we only managed to electrify 12% of the country - Kibaki 10yrs took us from 12-30% - Jubilee in 4.5% have taken us from 30% to 60%. Tell us what new disruptive technology has made this possible?
What matters is not "technology" - it the investment in infrastructure that GOK has put down - that has ensured you get connected for "free" at loan from GOK - which pushed connection from NARA 250K per year to now 1.3M or plus annually.
Some elementary reasoning would help. In addition to the fact that most USA electrification took place at time when technology, transportation, etc. were not what they are today---it might come as a surprise to you, but the technology has changed, materials have to be transported, etc.---you have forgotten a most basic fact:
Area of USA: 9,826,630 square kilometres
Area of Kenya: 582,650 square kilometres
Here's an exercise you will find useful: Put your hands around your neck. Now, gently reach above the neck. There, you will find a roundish object. It's called a head, and, contrary to what you might think, it has a purpose other than serving as a hatstand. So, use it accordingly.