Over the past decade, diaspora mobilization has become of increasing interest to International Relations scholars who study terrorism, civil wars and transnational social movements and networks. Nevertheless, an important area remains under-researched: conditions, causal mechanisms and processes of diaspora mobilization vis-a-vis emerging states, especially in a comparative perspective. This article asks why diaspora entrepreneurs in liberal states pursue the sovereignty goals of their original homelands through the institutional channels of their host-states, through transnational channels or use a dual-pronged approach. Empirically, the article focuses on a comparison between the Albanian, Armenian and Palestinian diasporas in the UK and their links to the emerging states of Kosovo, Nagorno-Karabakh and Palestine. Two variables act together to explain differences in mobilization patterns: the host-state’s foreign policy stance towards the homeland’s sovereignty goal; and diaspora positionality, the relative power diaspora entrepreneurs perceive as deriving from their social positions in a transnational space between host-state and homeland. If a host-state’s foreign policy stance is closed towards the sovereignty goal, but diaspora entrepreneurs experience their positionality as relatively strong vis-a-vis the host-state, they are more likely to mobilize through host-state channels, as in the Armenian case. If the foreign policy stance is closed towards the sovereignty goal, but the diaspora positionality is weak, activists are more likely to pursue transnational channels, as in the Palestinian case. If the foreign policy stance is open towards the sovereignty goal, but the diaspora positionality is weak, entrepreneurs are likely to engage with both channels, as in the Albanian case.