No? In what aspect? The ability of Mexico actually carrying out such a plan? OK. Probably the execution part is not plausible but the reasoning would be the same IF Mexico could.
Whole lotta people with central and southern american ancestry living in SoCal. California is nearly half of that ethnicity. There are far higher concentrations of that same ethnicity in Southern California. That's the basic premise. The basic premise would be the same. Here are a collection of people who share the same ethnicity as us, they are the majority of this region, therefore we should own this land.
Russia "annexed" Georgia on the premise that it was Russian land because Russians were living there.
Examine the situation in Crimea six years after its illegal annexation by Russia.
www.brookings.edu
It is also true that Crimea in 2014 had an ethnic Russian majority of about 60 percent — the only part of Ukraine where ethnic Russians constituted the majority. But it is equally true that, when the Soviet Union collapsed in December 1991, the resulting independent states recognized one another in their then-existing borders. Russia’s seizure of Crimea from Ukraine violated, among other agreements, the UN Charter, the 1975 Helsinki Final Act, the 1994 Budapest Memorandum of Security Assurances for Ukraine and the 1997 Treaty on Friendship, Cooperation and Partnership between Ukraine and Russia.
Merica is seeing a watered down version of this with the "Reconquista" movement.
The Mexican government is quietly aiding its citizens in the U.S. to become eligible to vote in our elections.
www.investors.com
So yeah. Comparison is pretty close, except for the tanks and little green men.