Not just the US I'm afraid.
I work in a college, and just a couple of weeks ago, caught one of my 16 year old students looking at freaking huge, two-handed machetes on the internet, during a lesson.
Me "should you be looking at that"
Him "I need one"
Me "Why would anyone need, let alone want one of those"
Him "The Zombie Apocalypse"
Me "Are you having a laugh"
Him "You will want one too come the Zombie Apocalypse"
Two minutes later he was showing me a video on Youtube of two guys, using the same machete to chop into zombie heads made from coconuts encased in ballistic gel.
The youth of today.