Why wont my 2003 Chrysler Town and Country limited turn on, it wont even crank

Have you had the battery load tested? The battery might have 12 Volts without a load, but under load it may dropp to an un-useable level.
Here is a diagnostic walk through for your situation. Just follow the link below;

https://www.2carpros.com/articles/car-engine-will-not-crank-over

The anti-theft system is part of the, "body Control Module" which is located under the dash on driver's side. I attached the wiring diagrams and diagnosis sheet ofr it.
To reset and get the system to re-learn you need a scanning tool. You might, they are ambiguos about this as it seems to only apply to radio, need the radio code or anti-theft code that you should have gotten with car. A dealership can get it for you, but it might not be cheap.
You might try disconnecting the battery for a minute and see what that does.
The wiring diagrams can be laid out 1of2 on left and 2of2 on right while mathcin up wires to have a complete diagram. Use this to check for loose, corroded or bad wiring.

I will watch for your post.