why are US sports different
There are further differences: US sports tend to need a lot of equipment (even basketball requires a basket, which is not as simple to improvise as a soccer goal of some sort for a street game); the games are structured, with frequent breaks, player called time-outs and effectively unlimited substitution (TV has driven a lot of that, but the elements seem to have been there from the start, and, yes, you can show soccer games on advertisement supported television); there is essentially no international competition in any of these sports; but, the strangest thing is that the leagues are fixed - there is no promotion or demotion - you can have catastrophical sequential losing seasons and you still get your main revenue stream (shared TV revenue) with no penalty - in the rest of the world the team games are ranked leagues and any team can be demoted from the first rank leagues and if things go badly a championship team can slide to oblivion in only a few years of bad management and player disaffection.
Why does the US structure its team leagues so there is no movement in or out of the first rank leagues? Why no demotion playoffs or rotation of the worst premier teams with the best second rank leagues?
On odd days I suspect this is telling us a lot about the culture.