what does this sentence mean?

[godhelpsme]

Once in Alaska, it would take these first North Americans thousands of years more to work their way through the openings in great glaciers south to what is now the United States.

 

[editec]

https://www.google.com/search?q=Onc...8&sourceid=chrome&espv=210&es_sm=122&ie=UTF-8

 

[jon_berzerk]

Once in Alaska, it would take these first North Americans thousands of years more to work their way through the openings in great glaciers south to what is now the United States.

or they simply followed the coastline

 

[CrusaderFrank]

Once in Alaska, it would take these first North Americans thousands of years more to work their way through the openings in great glaciers south to what is now the United States.

It means absolutely nothing. It's the ridiculous lengths people go through to deny sea travel in prehistoric times. Just ignore it

 

[rightwinger]

Once in Alaska, it would take these first North Americans thousands of years more to work their way through the openings in great glaciers south to what is now the United States.

It means you don't know how to properly use font sizes

 

[Mr. H.]

Now that those pesky glaciers are out of the way, we use cars to drive from Alaska to the lower 48.
We've drastically cut our commute time.

 

[whitehall]

Cold is the enemy of life. The human race was at a stalemate and barely surviving during the last ice age which was yesterday in geological terms. What causes ice ages? Look up.