"Democracy" is not binary. You can embody the idea of "democracy" to various degrees. For example, the US is certainly _more_ of a democracy now that African Americans and women can vote. In the future, it may become even more of a democracy if every adult can cast a meaningful vote regardless of what state they're resident in.
> (If you can realistically discuss seceding, you're in a free country.)
I'm not sure this has anything to do with democracy. Canada peacefully seceded from the [non-democractic] Commonwealth in 1867.