I was taught that Mexico is part of North America; it has always been part
of the North American continent; it did not attach like the rest of
Central America. As to fauna, I believe the major migration was from
North America southward.

________________________________
From: "Lysne, Mark (Wyle)" <LYSNEM@ONR.NAVY.MIL>
To: pbs@lists.ibiblio.org
Sent: Fri, March 19, 2010 5:47:43 AM
Subject: Re: [pbs] pbs Digest, Vol 86, Issue 32

Message: 13
Date: Thu, 18 Mar 2010 21:41:06 -0400
From: "Jim McKenney" <jimmckenney@jimmckenney.com>
Subject: Re: [pbs] Native N American crops
To: "'Pacific Bulb Society'" <pbs@lists.ibiblio.org>
Message-ID: <6FCE6BF68FB44DDD81C5574016E506A8@Library>
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Well Leo and Alberto, I think the answer to this one depends on how you
divide up the Americas!

For those who divide things up into North America and South America,
then
both of you are right.

I was thinking in terms of North America, Mesoamerica and South America.
That division is I think more common in biological discussions because
of
the huge differences introduced by the Mesoamerican fauna.
......