"I don't want to go to Mexico because..."

But really.
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"I don't want to go to Mexico because it's a desert and they grow crops and they have salvation and democracy!"

My oldest foster child yelled this at me on our way home from our mini vacation this past weekend. 

We were discussing a cruise that I am taking Miss Priss on in November and I told Big and Little Sisters that if they were still in my home I would take them if they wanted to go. Little Sister immediately got excited and started planning her trip to Mexico. Big Sister just shook her head no and stayed quiet. I asked her why she didn't want to go and that is when she yelled the craziness quoted above (It is honestly too crazy to type again, it hurts my heart and my brain a bit.).

Of course we all busted out laughing at this statement from Big Sister, not just because of how ridiculous it sounded, but because she legit thought that her statement was grammatically, religiously, geographically and historically correct. She actually got offended that we laughed and tried to reason with her. 

Now I will be the first to admit that I found this whole conversation completely hysterical when it first went down, and I still get a little chuckle out of it when telling friends about the look on her face when she yelled the nonsense, BUT I'd be lying if I said it doesn't concern me a bit.

What has this child learned in school!? What has she learned just from the general public, TV, Internet, etc. Maybe I'm over thinking this and should just consider it a teenager being a teenager, or summer brain, or whatever. Should this lack of basic knowledge concern me?! I'm still fairly new to the being a momma to a teenager thing, is this normal? Help!