I decided to remove the two English tags in favour of transatlantic-differences.
Should I have?
This question, If someone says "They insisted that he left", is there any ambiguity in BrE or in AmE?, doesn't have [american-english] because the OP is asking about ambiguity in BrE.
This question, What is the US English for "soppy"?, doesn't have either [american-english] or [british-english], just [transatlantic-differences]. I think this question should be tagged [american-english], too.
And this question, Difference between "everlasting" and "eternal", has both [transatlantic-differences] and [differences] and I don't see any reason why this question should be tagged [transatlantic-differences].
I know a few enthusiastic users have contributed a lot to streamlining the tag system on ELU for the last couple of months, but IMO, there is no harm in tagging as many tags as possible. We can tag maximum five.
If you think a question is about [transatlantic-differences], but tagged only [american-english] and [british-english], please just add the tag without deleting the two in the same way as we tag differences while leaving other related tags such as grammar, meaning, meaning-in-context, etc.