 Such instability should come as no surprise given the tensions typically giving rise to federal political orders in the first place, such as tensions between majority and minority national communities in multinational federations. Federal political orders are therefore often marked by a high level of ‘constitutional contestation’. The details of their constitutions and other institutions may affect these conflicts and their outcomes in drastic ways. Political parties often disagree on constitutional issues regarding the appropriate areas of member unit autonomy, the forms of cooperation and how to prevent fragmentation. Such sampling bias among states that federalize to hold together makes it difficult to assess often heard claims that federal responses such as granting some local autonomy perpetuate cleavages and fuel rather than quell secessionist movements. Some nevertheless argue that democratic, interlocking federations alleviate such tendencies (Simeon 1998, Simeon and Conway 2001, Linz 1997; cf. McKay 2001, Filippov, Ordeshook and Shvetsova 2004).