Bullshit.Useful feature of Glocks that make them preferred for law enforcement and security is the weapon can't fire if the magazine's ejected. Good for the ol' "Give me your weapon or I shoot the hostage." Can get trained in slyly ejecting the mag before handing it over.
I own a Gen 2 Model 17 and a Gen3 Model 27 and I carry one of them daily. I am also a certified armorer.
Glock owns about 85% of the law enforcement market and about 70% of the general market. Almost everyone makes a Glock clone: Smith, Beretta, Walther.
As for "American", I guess you could also buy a SIG (made in NH), or a Beretta (made in MD, soon to be TN).
1911s suck.