Bananas are one of the most widely consumed fruits in the world. This fruit is entirely imported from other countries that have the perfect climate to grow these fruits. So, you won't see banana farms in the U.S.
The banana that we are familiar with (as shown in this picture) is called the Cavendish banana. Did you know that this banana was actually man-made??? Okay, no, we don't have the ability of God to make fruit, but we certainly have the ability to "play God" and cross-breed different varieties of bananas until we get one that we like.
This cross-breeding perhaps took place in Africa around 650 A.D. As a result, seedless bananas developed and they probably looked similar to the Cavendish banana that we eat today.
Now, why make a banana without seeds? Well, obviously eating fruit where you have to constantly spit the seeds out is a pain in itself (just think about a watermelon with seeds!). But the "wild variety" of bananas (the natural ones you could find growing by themselves) have seeds that are very large and very hard! You can't just peel them and eat...unless you want to break a few teeth!
As for the origin of bananas, well, no one is really sure where they came from. Some archaeological studies would suggest that bananas have been cultivated first in Papua New Guinea and that they spread all over the world from there.
One of the things bananas are famous for is their potassium content. One large banana could have anywhere from 300 mg to 500 mg of potassium. But with the amount of potassium inside of a banana, a small amount of it is considered potassium-40, which is naturally radioactive. Potassium-40 is used in geology for potassium-argon dating of rocks. Wow...who knew that one fruit could be used for a science project?
India, Uganda (Africa), and China are the largest producers of bananas in the world. However, Ecuador, Costa Rica, and Colombia are the world's largest exporters of bananas, so when you get your bananas from a supermarket, it most likely came from one of those South American countries.