Where Did This Concept of Asia Come From?

There is no geographical boundary or separation between what they call europe and what they call asia. There was a confederation of anatulian principalities called asuva during the hittite mithani time, which is about 15 hundred b c. The romans distorted that into asia. And now the americans have decided that we will not use the term the indian sub continent to talk about the indian continent, a sub continent. Instead, we will call it south asia. Great news for the people of south asia and great news for south asian origin people in the us.