He didn't land in what is known as North American soil. He landed on one of the islands east of Florida, the present day Bahamas. He thought he was in India (his original destination)so he named the indigenous people 'Indios'.
That's why people mistakenly call all native people of North, Central and South America 'Indians'.
That's why people mistakenly call all native people of North, Central and South America 'Indians'.