Many authors, such as John Maynard Keynes, have identified the early 20th century and particularly World War I as the point when such controls became common.
Banyak penulis, seperti John Maynard Keynes telah mengidentifikasi awal abad ke-20 khususnya Perang Dunia I menjadi titik awal kontrol perbatasan internasional menjadi umum.