The Laws of Migration is a book of E. G. Ravenstein of 1885.
Ernest Ravenstein is considered as the first migration theory.
Ravenstein was an English geographer who used data census tracts from England and Wales to develop what became known as the laws of Laws of Migration.
He concluded that migration was governed by process push-pull; that is, by unfavorable conditions in a place (oppressive laws, heavy taxes, etc.) that they pushed people to other places.