1. IntroductionThe European Union (EU) seeks to strengthen the integration capacity of new members, current and potential candidates as well as its Eastern neighbors by helping them to make their domestic institutions and policies conform to the EU's norms and values and by building their capacity to provide collective goods and services. Modes of economic integration aim at mitigating competitive asymmetries and fostering the sustainability of EU market rules. Modes of political integration, in turn, aim to promote democratization and democratic consolidation, and to strengthen governance capacities of new and non-members.EU membership has been considered the key factor in strengthening the integration capacity of post-communist countries in the context of Eastern enlargement. Accordingly, the ineffectiveness of the European Neighbourhood Policy (ENP) in bringing about the domestic change that conforms to the EU's expectations tends to be blamed on the lack of this golden carrot. Likewise, the stalling of domestic reforms in current and potential candidates (Albania, Turkey, Bosnia Herzegovina, and Macedonia) as well as the potential back-sliding of some of the new member states (Bulgaria, Romania, Hungary, Latvia, cf. Borzel 2014) are explained by the carrot already being eaten up or not being juicy enough (any more). At the same time, however, we do find that Eastern Neighbourhood Countries (ENC) engage in domestic reforms the EU has been promoting, mostly at the policy level (Langbein/ Borzel 2013) but in some cases also with regard to political institutions (Borzel/van Hullen 2014b).This paper reviews the literature regarding the modes of political integration the EU has developed and applied to shape state-building, democracy and rule of law in the new member states, in the current and potential candidates of the Western Balkans, and in the ENC. The first part develops an analytical framework of modes of political integration that combines two concepts: the mechanisms the EU uses to induce political change and the actors targeted by the EU with these mechanisms in its attempt to shape their preferences and build their reform capacities. Particular attention is paid to more indirect mechanisms, such as competition and emulation, which the Europeanization literature with its focus on conditionality and assistance has overlooked so far. The second part uses this framework to make an inventory of the EU's modes of political integration systematically tracing their evolution over time. The analysis draws on a comprehensive review of the general literature complemented by the findings of four separate case studies on the EU's attempts at promoting and protecting rule of law as well as strengthening the governance capacities in past candidates and new members (Dimitrova 2015), current and potential candidates (Fagan 2015; Mufteler- Bac 2015 a), and the Eastern Partnership (EaP) countries (Borzel/Lebanidze 2015). I show that the EU's political modes of integration developed through an incremental process of learning by doing rather than through a great master plan by the EU to strengthen the integration capacities of new and non-members. These political modes initially emerged in the development cooperation of the EU with the so-called African, Caribbean, and Pacific Group of States (ACP), then travelled to the Eastern enlargement process and to the ENP and finally also spilled over into the domestic politics of the EU vis-a-vis its new member states.This might suggest that the EU has pursued a one size fits all approach. The analysis indeed reveals some interesting similarities of the modes used by the EU to promote the integration of new member states, candidates, and neighborhood countries. These similarities have been propelled by the lessons the EU has learned over time. While conditionality continues to play a prominent role, it has become more differentiated, both with regard to the rewards offered and the benchmark set to obtain them. …