Simultaneously, institutional and legal adjustments were continued, resulting from the accession to the European Union. The Accession conditions were negotiated, being the main strategic goal of Miller’s cabinet. On 13 December 2002, at the summit in Copenhagen (Denmark), Prime Minister Leszek Miller completed the negotiations with the European Union. On 16 April 2003 in Athens, Miller, together with Cimoszewicz, signed the Accession Treaty, bringing Poland into the European Union. Miller’s government, in collaboration with various political and social forces, organized the accession referendum with a successful outcome. On 7 and 8 June 2003, 77.45% of the referendum participants voted in favor of Poland’s accession to the European Union. The referendum turn-out reached 58.85%.