It seems to me quite sensible to assume
that european future americans
displayed much more than average initiative
to leave their homelands, sail across the sea
and start a new life. Their descendants would
surely inherit some of that quality in their genes
and that 'get up and go' might then explain
the drive of present day white americans.
So it also seems quite plausible to presume
that african americans should someways
surpass their pale skinned current compatriots.
Perhaps their ancestors showed less initiative
in letting themselves be captured and sold as slaves.
But those that survived the involuntary voyage
across the sea surely had more than average
physical and mental strength which surely would
have survived in the genes of their descendants.
Perhaps it's a pity those genetic qualities
may have been diluted by the murder
of recalcitrant slaves and the sexual
predation of some white slave owners.
.