[DiogenesLamp]

Maybe you should read his statement a little closer. He admits the land cannot be used, but then goes on to say with a lot of work to create irrigation systems, it might eventually be used.

As for Gold Mining and Washing? They had 80 years they could have had slaves in New Mexico territory, but they didn't.

Real world data beats ginned up Theory every day of the week.

And if you said "your former President" to me in person, I would hit you in your obnoxious mouth.

[Ditto]

He admits the land cannot be used, but then goes on to say with a lot of work to create irrigation systems, it might eventually be used.

Allow me to help you with your reading comprehension.

…therefore the only species of labor that can readily supply its place under our Government would, I think, be the domestic servitude of African slavery; and therefore I believe it is essential, on account of the climate, productions, soil, and the peculiar character of cultivation, that we should during its first settlement have that slavery in at least a portion of California and New Mexico.

[Ditto]

As for Gold Mining and Washing? They had 80 years they could have had slaves in New Mexico territory, but they didn't.

Hummm. 80 years?….

Treaty of Guadalupe Hidalgo (1848)
This treaty, signed on February 2, 1848, ended the war between the United States and Mexico. By its terms, Mexico ceded 55 percent of its territory, including the present-day states California, Nevada, Utah, New Mexico, most of Arizona and Colorado, and parts of Oklahoma, Kansas, and Wyoming. Mexico also relinquished all claims to Texas, and recognized the Rio Grande as the southern boundary with the United States.

So you are saying that since 1780, they could have dragged their slaves across French, Spanish/Mexican territory to mine gold in New Mexico. Hummm?