What factors lead to the British Invasion during the 1960s? Were American acts actually much less successful, and, if so, why?

by oxyhydroxide
Vespertine

Not to discourage further answers, but this recent thread, especially the response from u/hillsonghoods about the social context, may interest you: https://www.reddit.com/r/AskHistorians/comments/84avql/what_happened_in_the_uk_during_the_60s_that/