basically.. for the country which gave birth to the earlist genres of dance music, techno from Detroit, and house from chicago/NY formerlly disco. It wasn't long before Hip-Hop really blew up. which was an incredible moment in musical history, and many people in NY in the late 80's felt a connection with it, it overshadowed techno and house to an extent, which remained very underground scenes in underground clubs like the paradise garage in NY.
meanwhile in the UK an equally exciting movement was developing, Acid house & Hardcore, illegal raves held in fields with thousands of people all for the music (ecstasy Boom) it's undeniable that this music was partially influenced by the detroit tehno legends (jeff mills, juan atkins), but it was rougher and toucher. Hardcore came about which used heavily chopped up samples of the Amen break. This was UK rave culture. This just kept developing and morphing and splitting into so many directions, and so many sounds, labels, and movements. there was jungle shortly after hardcore, which became drum n' Bass, you had UK garage into grime, and at around 2002 the last underground genre was born out of london... DUBSTEP.. which is a dirty word now. it was actually around before skrillex, those early dubstep nights in london were unforgettable. just a dark room, a huge sound system, guiness, and the sweet smell of ganja in the air, those rumbling 18" bass bins rattling your rib cage.
it was only a matter of time until a major label discovered it, took it from us, diluted it down to maket towards americas frat boy suburban ex emo scene. got britney spears to sing 'dubstep'... then they cashed out, got bored, and left us all in london like...
'what just happened?'
my answer to your question is: America is a very very big country, with many inhabitants from all over. the impression i get from current young people in the US now is that they are so fucking impatient, and naive. i mean u can't help where you were born, but when there is not much of a musical influence around you as you are growing up, you won't always develop a deeper appreciation and connection to music. they are happy to listen to top 40 their whole life, thats fine if thats you, you are probably busy, BUT. If there are not enough younger people digging deeper to find a wider range of dance music from around the world, it creates no market or audience, Therefore as a promoter or festival organizer, even if you are booking some legendary Dj's from the UK or Europe, chances are the general public won't really care unless he's wearing a mask, or throws cakes into the crowd and everythings neon and flashy, face paint and testosterone fuelled machoism.. the music becomes secondary, the light show comes first. Unfortunately this is why the US lacks many decent music festivals
Romania
) with lyrics ta make ya eyes water... Keep Struggling... 
