“…Increasing population pressure on available agricultural land has reduced the welcome for migrants as workers or clients, especially, of course, at times of economic stress. Citizenship law has also been instrumentalised to bar from office individual politicians alleged to have origins in a neighbouring state (Whitaker, 2005;Manby, 2019), or generally to disenfranchise or constrain the economic power of historical migrant groups (Muzondidya, 2005;Aminzade, 2015;Ng'weno and Aloo, 2019); while the expulsion of alleged foreigners has been used almost as a tool of nation-building (Gray, 1998;Bezabeh, 2011). It is, however, hard to see an obvious pattern among those that chose to introduce explicit ethnic discrimination into the citizenship law, which include states amongst the most and least diverse on the continent (Manby, 2018, chap.…”