Meanwhile, the Spanish Empire collapsed, giving the United States all the rest of the territory west of the Rocky Mountains.
The Spanish Empire in North America did not "collapse" into U.S. custody. The Mexicans revolted against the Spaniards and gained their independence in 1822. The United States conquered all that territory in the 1840s from the Mexicans, not the Spaniards, during the very cryptically named Mexican-American War. I can understand how the author got confused over that.
I won't waste my time, or anyone else's, pointing out all the other nonsense in this article, because there's plenty of it, and my attitude towards piles of dog poop is that you just throw them in the toilet and flush. You don't waste your time analyzing them.
All hail the judiciary eh?
Over you head and heart both it is, sir. Cheers!