The Vikings, the muslims, the Chinese, the Irish and many others had apparently made it here before Columbus. The difference is that Columbus was able to return home with accurate maps of how to get here and was the first of many from Europe who followed his maps to return and to start exploration, explotitation, trade and settlements. He should get the credit, he left a mark. If muslims found there way here they apparently left nothing and didn’t have the foresight to recognize and/or couldn’t find their way back.
Is Islam becoming more stupid, daily?