It's GIF, not JIF.
But you have to consider the size of the US and the size of the population.
We have literally thousands of accents here as people came from everywhere.
Each generation will carry that accent of their parents diluted a little bit.
Close knit groups, like the Amish around here, don't get diluted very fast.
The people who don't mend their ways .... Soylent Green.
