re: What two adjacent decades are the most different when juxtaposed against each other?

I’m going with 40’s-50’s. Went from war and despair to the beginning of modern life.. 90’s-00’s is a close second

I'm with the 40's to 50's. I can't base that on technology, rather how the population behaved.

In the 40's we had world war, depression era folks, young and old, who were intimately familiar with both the tragedies of war and the desperation of economic depression. The 50's offered the first relatively peaceful period in 35 years (Korean war notwithstanding). By the late '50s, commercialization was really taking hold. As were shifts in music (blues going "white" and Elvis), counter-culture (beatniks, Hell's Angels, etc.), lifestyle (suburban life, as mentioned), college educations becoming more mainstream, etc.

Technologically, there's no doubt it's 00's to 10's, but it's going to be like that every decade from here on out. We're just advancing at an incredible rate technologically and that rate will do nothing but increase. There's going to come a time where our kids will make fun of 2 year old tech.

My first thought was 70s to 80s but 50s to 60s probably takes it.
I get the 2000s to 2010s premise, but I don't general lifestyles are that incredibly different, just a higher proliferation of better technology. I mean in the mid-2000s I was still gaming online and instant messaging with my friends. The means to do that now are just way better and/more available.

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while having a cultural and generational revolution.

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Much of that counterculture started in the late 50's. The 60's, via modern day coverage of VietNam protests and hippies, would seem to be the source but, by 1960, that counterculture was already going mainstream (especially out West and in NYC).

Almost we everything in this country is economically driven. Business, art, entertainment,
Government. The entire decade of the 30's was spent in The Great Depression. People starved to death in this country. The decade of the 40's, save the very first part, was spent in prosperity, albeit a wartime prosperity. Post war things were fine. Expansion boomed.

Per your thread title, hard to imagine things being more different decade to decade. You could perhaps cheat and take groups of 10 years but tough to find calendar decades.... in my view.

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And it’s crazy, but we are just thinking about this country.

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We’re just thinking of this century. Think of living here in the 1850’s and 60’s.

The leap from old cell phone to smart phone is not as drastic as the leap from no phone to having a phone or no radio/TV to having radio and TV. The leap to no internet to having internet was larger as well. During the 80s there was no internet in regular households. Businesses had no sites and .com wasn't really heard of. From personal experience the leap from mid eighties to mid nineties was greater than any after.

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60s and 70s.

Went from the "golly gee" wholesomeness and neat appearance to acid-fried hippies and other assorted uglies fricking everything that moved and some that didn’t move.

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You seem a decade behind. Golly gee ended with Eisenhower, but I've always heard a segment of the country's populace skipped the 60's, and went from the 50's, right on into the 70's.

Was going to say the same decades (60's and 70's), but for entirely different reasons. The 60's were filled with hope, capped by men landing on the moon.

The 70's made us realize that the powers that be will make sure their almighty dollars will reign. Watergate made us realize that men in power will squash a growing movement away from them. In the 70's, American car companies manufactured crappy automobiles that guzzled ridiculous amounts of gas.

The 70's did have good music, movies, and TV. Most of that was fueled by major companies making money off of the 60's hippie/radical culture.

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1920s to 1930s. Rolling 20s into the great depression

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i believe this is your answer. life went from ok and good to literally having nothing for most of the country in a few short years.