There's no one specific northeastern accent. But I assume what you mean by "British" is the fact that the traditional dialects of New York and New England are non-rhotic. The r is not pronounced after vowels; only after consonants. Most American dialects have rhotic accents. A good number of British dialects are non-rhotic, so this is probably the "British" quality you are talking about as it is one of the most notable parts (though the vowels are still completely different)
In these areas, "spa" and "spar" sound the same. "idea" might also be pronounced as "idear" in these non-rhotic accents, too. Being from New York, this is very, very common, though my own dialect is rhotic.
But there's no such thing as a single "British" accent, either; there are rhotic accents in Britain. Britain is very, very diverse in its dialects, so to call a single one "British" is ********. I'd assume you'd mean Recieved Pronounciation, though, but not even
remotely all British people speak like that.
The reverse; Red indicates rhotic accents in England. "spa" and "spar" sound the same in the white area.
That accent isn't "British". It's "New York stupid".
This is America. We have a ton of different dialects. We don't have a standardized dialect, either. It's ******** to call a dialect "stupid" when it says nothing about the intelligence of the person saying it or their education levels, they really can't help themselves and there is no prestige for a particular dialect.
