I'm not american, but they always seem to do month.day.year for some bizarre reason
It's one of those things that America inherited from England, and then when England changed its method, the Americans saw no need to change because it wasn't part of England anymore.†
If you go into antiques stores in England, you will find that with items that are engraved, the older it is, the more likely it will have the now-American date format.
There was an item on Antiques Roadshow a couple of months ago that was a gift from Queen Victoria to someone that had an engraving that included the American date format.
† This is true for a surprising number of minor differences between America and England. In life, it's often better to understand the history of things, rather than just ignorantly write off a group of people as bizarre.
It's one of those things that America inherited from England, and then when England changed its method, the Americans saw no need to change because it wasn't part of England anymore.†
If you go into antiques stores in England, you will find that with items that are engraved, the older it is, the more likely it will have the now-American date format.
There was an item on Antiques Roadshow a couple of months ago that was a gift from Queen Victoria to someone that had an engraving that included the American date format.
† This is true for a surprising number of minor differences between America and England. In life, it's often better to understand the history of things, rather than just ignorantly write off a group of people as bizarre.