Every term of the ethnics are rarely as singular of a group as theymake it sound. By the time of a drastic technology change, the onesreceiving dominant amount of reward would rapidly replace others ofdifferent trait. The taller will forget and disregard the shorter, thefaster would disregard the slower, the more conservative would forgetthe rabid, and etc. So much for a group they are.

In addition, an anamolie, an unique person let's

say a 2.50 meter long giant occurs within that 'group', 

then does the definitionof the ethnicity or nationality it 

belongs to change along with?  

In some ways, the ethnic group never exist.  The names

are more empty than company brands.  When gene change

start, and most people pick up a different trait, the name

may retain, but the people have changed drastically and

probably are never reconizing the difference from 

previously existed folks not long ago within the same ethnic 

name.

Name continues, the residents changed.

Sometimes, changed into a different set 

of folks, with different faith perhaps.