Columbus day is the day marking the arrival of Christopher Columbus to the Americas. Christopher Columbus technically did not discover America as it had already had civilization, but at the same time nobody on the eastern hemisphere really knew of the americas and he discovered the americas for THEM, but not for those on the western hemisphere. in short, Columbus day is just a day marking some Italian guys arrival to a country and him telling his friends about it, it’s really just meaningless now because it’s mostly common knowledge that Christopher Columbus didn’t technically discover the America’s, instead he just introduced the Americas to western Europe.