At least in terms of grammar and phrasing, American is actually the
more preservative and British is the one that has changed.  If you
look at newspapers on both sides of the pond from 1720 or so, they
look similar... and they are both closer to modern American than
to modern British.

This is typical of languages in general.  More change happens
in the 'motherland', while separated or isolated communities tend
to hold steady.

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