let 'em go

I've just found out that there is a "League of the South". From their "Core Beliefs" web page:

At its founding meeting in June 1994, The League of the South adopted the following Statement of Purpose:

We seek to advance the cultural, social, economic, and political well-being and independence of the Southern people by all honourable means.”

"Independence". Good heavens. Couldn't they just petition to leave? And why would we not just let 'em go?

But they gotta take Texas.