According to Lawrence Rosen, ethnic background is not a crucial factor in marriage between members of each group in North Africa, when compared to social and economic backgrounds. There are regular Hate incidents between Arabs and Berbers and Anti-Arabism has been accentuated by the Algerian government's anti-Berber policies. Contemporary relations between Berbers and Arabs are sometimes tense, particularly in Algeria, where Berbers rebelled (1963–65, 2001) against Arab rule and have demonstrated and rioted against their cultural marginalization in the new founded state.