The Grand Alliance between the USSR, UK, and USA broke down following disagreements over postwar arrangements in Germany, Poland, and Eastern Europe. At conferences in Tehran, Yalta, and Potsdam, the allies disagreed over the governance of occupied territories, borders, and the establishment of communist governments in Eastern Europe against the wishes of the Western allies. Ultimately, Stalin's refusal to allow free elections in Poland and Eastern Europe, as agreed, combined with growing Western fears over the spread of Soviet influence, led to the final breakdown of trust and cooperation between the former allies, marking the start of the Cold War.