That they have. In fact, they are secure to the point that they are the only province with no provincial sales tax. But Ontario has things like the bulk of Canadian manufacturing, some of the richest farmland in the world, uranium mines, the other NORAD station, and more fun stuff. Ask all the 19 year old Americans who come up here to drink legally. ;)
More on topic (sort of): Did you know that standard time was invented by a Canadian?