Why is corn called Indian corn?

What we call 'Corn' was actually a small grain type of plant that the Myan's manipulated by cross breeding the plant until it had a single husk over multiple seeds, instead of a husk covering each individual seed [kernal] This was to make it easier to farm. 'Shucking' a single husk was much easier than shucking a husk from each seed. They called this plant maize.