Problem
Forty-six years separate Ousmane Sembène's La noire de.../Black Girl (1966) from Moussa Touré's La Pirogue/The Pirogue (2012). Mweze Ngangura's Pièces d'Identités/ID (1998) can be located somewhere halfway between the two films.
From these three films, what single most significant shift or change in immigration trends, policies or practices can be detected in the said forty-six years?