Once upon a time most of us thought that long rifles were invented here because that's what was written over and over again.
Here is the old fairy tale: "Jaegers were short, big bored, and used a lot of lead and powder. The colonists needed and wanted the accuracy, but needed it to be cheaper to shoot, plus the powder here was "iffy" so long barrels were needed to burn it all. So colonial gunsmiths wedded the long English fowling piece to the short Germanic jaeger and the longrifle was born." I am poking fun at it, but lacking more data, it was a reasonable hypothesis or explanation, that unfortunately became accepted as real history or fact the more it was repeated.
Now we are seeing more original European rifles with longish barrels. Not so many 4' long but not so many American rifles with barrels that long either. We don't know much about the early imports, who made them, where, what they looked like, except for some newspaper ads which offer little detail. Nor do we know why the American colonial market wanted long barreled rifles, but there are some good theories out there which are totally unsupported by any historical accounts, which are scant to non-existant. Gunsmiths just didn't keep journals about why they built what they built, or what customers were asking for, and they didn't have hunting magazines with articles on the latest trends in guns and ammo. So we are forced to speculate and folks take strong stands behind one theory or another, because that's all we can do.