To understand the usa one must understand English history. Very briefly The main points are;

Henry VIII 1535 attacked The Holy Roman Catholic Church in England appropriated all of it’s property and attempted to eliminate all Roman Catholics from the realm. He replaced The Roman Catholic Church with a so-called church of England or The established church and that places the sovereign of England at it’s head. In other words government and church are the same. It is basically a carbon copy of The Holy Roman Catholic Church except it has the sovereign of England at it’s head rather than the pope. This policy has continued until this very day. Those subjects that did not want a carbon copy of The Holy Roman Catholic Church formed separate groups for example the so-called puritans and those groups are classified as non-conformist. I.e. they did not conform to the ideas of the established church not to those of The Holy Roman Catholic Church. We see that in the English speaking world then as now there are three separate groups. A. The Holy Roman Catholic Church, b), The established church ( the church and government), and c) The non-conformists. The armies of the established church attacked and eliminated the original Roman Catholic settlers of the new world, (New Spain and New France) and replaced them with their own and using former Catholic's as slave labour. This lasted until the non-conformist groups were strong enough to over throw the Government (the established church) and set up their own government in 1776. So we have the established church as the church and state in England and Canada. And we have the non-conformists as the church and state in usa. All planned from the start of the English reformation and perhaps before that.