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Try doing a Google search :

Search terms.. " Ice Age Sea Level "..

Take a look at some of the links, including those referring to "global warming"..

You will find maps / graphics showing what was the projected amount of additional land mass on the american eastern seaboard, western europe seaboard, southeast asian land bridge, siberian land bridge..

It's very hard to imagine the amount of available land that is now under as much as 450 feet of seawater.. until you see the graphics..

I think we will eventually find that climatic variations allowed for variations in the glacial coverage numerous times during the last ice age cycle..
Sometimes more, sometimes less..

We have historical precedent.. 1,000 years ago, the early norse explorers left greenland and went NORTH along the greenland coast, before heading west to america..
We were in a warming trend at the time.. it was warmer then than it is now.. ( planetary average-wise )
500 -600 years later, earth was hit with a mini-ice-age.. we're still coming out of that.. and we have seen, in our own lifetime, that on a year to year basis, and decade to decade, climatic changes can take place on a regional basis, as well as more locally..

Ice age travellers would have been those already familiar with the environment, like the Innuit.. Kayakers, seal hunters, ice floe riders, fishermen..
Following the advice of some ancient Sam Kinnison, they would have "gone where the food is"...
Seems logical that some families, following herds of seal, sea life migrations, etc., would occassionaly follow to the west.. to america.
Logically, (Jim) they would find better climates to the south, work their way into the gulf, and spread westward along the more temperate areas of the north american continent..
With the retreat of the glaciers, new hunting grounds would open up to the north..
With the opening of the Beringian passage(s), new game would arrive from the north.. hunters and their families would naturally head for the source of that game..

Another personal surmise of mine is that the Mandan may have been descendants of some of those original western travellers..
The Mandan were once the largest "native american" nation on the continent, populating the vast majority of the midwest.. numbering in at least the 10's of millions..
They populated the Mississippi and Missouri River valleys, from the gulf all the way to Montana..
Smallpox wiped them out, leaving less than 1,000 survivors of the Mandan nation..
The survivors were eventually adopted into the Sioux nation..

I'm wandering now, the Mandan are a sore point with me..
I'm done ranting..

Here's a map of the world with the water level reduced by a little over 300 ft.

Thanks. I have looked a a few of the glaciation min/max maps, and amongst other things, a large part of the Gulf of Mexico was once dry land. The western shelf of Florida and the Yucatan were particularly large chunks. Like some others, I believe much/most of our history is under several hundred feet of water.

FGS