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Every ice age is accompanied by a sea level drop, last one was around 450 feet. What the North American continent loses in Canada would be gained on the Blake plateau, the submerged plateau of the continental shelf that was all dry ground during the ice age.
During the last ice age, sea levels were 120 meters lower than today. Here's a handy sea level calculator that shows land extent. Type in -120 to see Florida double in size. http://merkel.zoneo.net/Topo/Applet/appletTopo.php?lang=en&file=eastUSS There is a much more detailed one out there I saw a few years ago, but I can't find it again.
Dan Scott
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