There is absolutely no question in my mind that the midwest produces many outstanding whitetails, but the ratio of Boone and Crockett whitetails to the annual harvest of each area would likely prove this statement is a bit off base.
"iowa, illinois, kansas and ohio have just as many big bucks as the great white north"
Alberta produces between 35 and 50 Boone and Crockett whitetails annually, out of a harvest of around 40,000 total. That's somewhere between 1 in 800 and 1 in 1200 whitetails taken makes the book. You may look at the latest copy of the Boone and Crockett book and see far fewer entries than my information would support, but very few whitetails from western Canada get entered, unless they are very high scoring, say 190 or better these days.
I don't know about Iowa, Kansas, or Ohio, but I do know Wisconsin's Boone and Crockett ratio last season was 1 in 17600. (36 Booners out of a harvest of 619,000 whitetails.
I'm not trying to step on anyones toes around here, that is not my intent in any way. I'm also not trying to convince anyone to come to Alberta to hunt -- those that choose to come here usually don't need any convincing!
Good luck this season. NW