There is one aspect that I just thought of:
It seems that it is a good possibility that when these places became colonies that they also started to become more legalistic with systematic applications of all laws and maybe even turning religions that were NOT enforced into points that eventually became part of legalism.
Look at the madness of zero tolerance descending on the USA now. Ironically, it is also happening at the same time as more rights for gay, transgenders and so on. But on the other hand, civil forfeiture is a massive violation of the rights of all of us. This is a type of hyper legalism. How much less legalistic were we 50, 100, 200 years ago? Also the increase of technology can legalism more practical.
Just shooting from the hip on this.