Even though there are apples ALL OVER the U.S., China is the largest producer of apples in the world. The U.S. comes second, and the only reason the U.S. even produces apples is because early English settlers brought them to the U.S. in the 1600s.
The only apples available in the U.S. during that time were the crab apples, and they weren't edible...or they just tasted nasty. So, the folks from England brought over apple seeds to the "New World," and then came mass planting of this fruit all over the U.S. But one man in particular, John Chapman, was famous for planting apple seeds all throughout Ohio, Indiana, and Illinois. This earned him the nickname "Johnny Appleseed."
We could credit the English for bringing apples to the U.S. And the English could credit the Romans for bringing them apples when the Romans conquered them back in the first century B.C.
So, when you see an apple tree or an apple at your local supermarket, remember that the apples were a result from lots and lots and lots of crazy planting from European settlers. They loved apples so much that they wanted this country to be filled with them.