Red, yellow and green area while recruiting armies

Red, yellow and green area while recruiting armies - Five Assorted-color Cacti

When I use my pre-made army models to recruit, my provinces changing color to green, yellow or red.

It's obvious that green means you have enough ressources to buy your model and red you don't.

But what does it means precisely when my provinces are yellow ?

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Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Scott Webb, Enric Cruz López, Chris F, Engin Akyurt