What are the effects of granting statehood?

[unmerged(3999)]

I know it 1) allows factories to be built and 2) prevents enemies in colonial wars from entering the state. I know it does not eject colonial-war enemies who are already there - my Cunning Plan(tm) to kick the Mexican Army out of Oklahoma by granting it statehood failed.

Are there any others? Thanks.

 

[Johnny Canuck]

The costs for certain budgetary items like education are greatly increased for POPs in states as opposed to POPs in colonies (can't remember the exact numbers off the top of my head), so when you grant statehood to a colony, your expenses will go up.