Greg,
maintains that George Washington and Thomas Jefferson took up arms against the government of the United States in the cause of Slavery.

No. I maintain that they were slave owners.
If supporting slavery is the issue, Jefferson and Washington have to go too.

" traitors who fought a war,"

Traitors because they wanted to secede, like Irish home rulers and today's Scottish Nationalists?

Here in Britain we believe in people's right to self determination.

I know that the US Civil War is still and emotive and divisive issue over there. As a foreigner I probably will never understand, so I will say no more.