America made itself that way, but back then, there were more enemies than any European Country had. And still the statement was made. And yes, I still believe it even if I was living in 18th century America.
But most of your ennemies could reach you only by sea, and that's a menace that your formal military (navy) have to deal with outside of your native ground. The only "real" ennemy that could take your territory was Mexico, and we all know what happened when you got your guns toting against them. Your heartland of the time wasn't even remotely treathened.
After, there was only outlaws and indians that would be a treath, and my earlier statemen still stands, methink. It was more efficient to let people fend for themselves than trying to provide security for everybody.
Compare to France, which has Germany and Spain right on its doorstep. They have to rely more on government rule, as an invading rival is a reality, and has been for hundreds of years.
Compare to Britain, which is on an island. They trust less their own government, as they've had natural geography to defend themselves. They did not had to put much faith into their government to prevent invading forces, but merely put faith into their own navy.
There is a lot of cultural influence that your geographical position give you, over the years, and how much you rely on the government. The most extreme case would be Russia. They have no geographic defensive feature whatsoever, so they needed to conquer land in order to defend themselves with buffer zones. So, they were forced to turn toward the government a lot more over time, and developped a culture around it.