1919Supreme People's Council declared Poznan independent. (Note: The Supreme People's Council was a political organization in the Prussian Partition of Poland, which played a major role during the Greater Poland Uprising (1918–19). It was established in 1916 in Poznań as an underground Interparty Committee (also known as the Central Citizen's Committee. After the World War I armistice, the committee renamed itself to the People's Council and later to the Supreme People's Council. The Council self-disbanded on August 19, 1919, when the power in the area was transferred to the re-united Second Polish Republic.
COMECON (Council for Mutual Economic Assistance) was instituted by Stalin to offset any influence that the Marshall Plan would exert over the Soviet satellite states, in particular Czechoslovakia and Poland. Comecon was created to prevent countries in the Soviets' sphere of influence from moving towards that of the Americans and South-East Asia. Comecon was intended to strengthen an economic alliance among socialist countries and was the Eastern Bloc's counterpart to the formation in Western Europe of the Organization for European Economic Co-Operation (OEEC). (The Marshall Plan was implemented by the United States to provide financial assistance to help rebuild Western European economies after the end of World War II.)