What is Montana if not at-will? at-king-doth-give-you-thou-shalt-command?

It just means that there's an initial probationary period where the employment is at-will, and beyond that point the employer must have a reasonable cause to terminate the employee. I'm not at all familiar with Montana labor laws in practice, but I find it very difficult to believe that it makes much of a difference.

Wow, nice. I thought it was mostly just the south.

"At Will" and "Right To Work" are different things, but often confused as being the same thing.

Right To Work states are indeed mostly in the South.

Ah this is the tidbit I needed. Thank you.