His point of high church vs. Protestantism is a good one. We in the US practice a kind of competitive Protestantism designed--at least partly, if not mostly--to make the adherents feel good about themselves. There is a distinct difference between submission and proselytizing.

There is also something to the state of empire as well. The British empire had been in steady decline for a very long time before Adams or Fry started making people laugh, whereas the American empire has been ascending quickly since WWII. This sort of gestalt is hard to ignore and will certainly influence things. For example, would a 'Blackadder' sell as well in 1890? This is around the same time 'King Solomon's Mines' was selling briskly, and Haggard's story is instantly recognizable by any modern Hollywood writer.

On some level Americans are British people time-displaced by a couple of generations.