One of my ancestors was an American. They emigrated from Germany by way of England, supposedly due to religious persecution. And they settled in America, If I remember rightly the latter half of the 17th Century. They married into a Local Mohawk tribe near New York. Then one of them came to Britain and settled. So you have to ask the question, if Britain and its monarchy was so authoritarian, why were people coming back from America to the Uk? Because, like much else of early America, its probably a myth.
Im sure the crafts guilds in England were another reason for emigration. But it illustrates, economic migration is really nothing new.