there appears to be some arguments about where mario came from. if you want to, put your ideas here.
i think that:
mario and luigi were born in the mushroom kingdom. but, bowser was stirring up trouble, and their parents thought it would not be safe. so they somehow transported to brooklyn, and laid their twins on the porch of an italian couple. when mario and luigi grew up, they got into the plumbing buisness, and...you know the rest.
Sono ichi fanku-ippai!