Question: When did the U.S. and the country in effective control of political and military functions of the group the People's Socialist Republic of Albania was a member of become allies?

Knowledge 1: Warsaw Pact
The Warsaw Treaty's organization was two-fold: the Political Consultative Committee handled political matters, and the Combined Command of Pact Armed Forces controlled the assigned multi-national forces, with headquarters in Warsaw, Poland. Furthermore, the Supreme Commander of the Unified Armed Forces of the Warsaw Treaty Organization which commands and controls all the military forces of the member countries was also a First Deputy Minister of Defense of the USSR, and the Chief of Combined Staff of the Unified Armed Forces of the Warsaw Treaty Organization was also a First Deputy Chief of the General Staff of the Armed Forces of the USSR. Therefore, although ostensibly an international collective security alliance, the USSR dominated the Warsaw Treaty armed forces. [SEP] Knowledge 2: Allies of World War II
At the start of the war on 1 September 1939, the Allies consisted of France, Poland and the United Kingdom, as well as their dependent states, such as British India. Within days they were joined by the independent Dominions of the British Commonwealth: Australia, Canada, New Zealand and South Africa. After the start of the German invasion of North Europe until the Balkan Campaign, the Netherlands, Belgium, Greece, and Yugoslavia joined the Allies. After first having cooperated with Germany in invading Poland whilst remaining neutral in the Allied - Axis conflict, the Soviet Union perforce joined the Allies in June 1941 after being invaded by Germany. The United States provided war materiel and money all along, and officially joined in December 1941 after the Japanese attack on Pearl Harbor. China had already been in a prolonged war with Japan since the Marco Polo Bridge Incident of 1937, but officially joined the Allies in 1941. [SEP] Knowledge 3: Hero of Socialist Labour (Albania)
Hero of Socialist Labour () was an honorary title in Albania and other Warsaw Pact countries. It was the highest degree of distinction for exceptional achievements in national economy and culture. It provided a similar status to the title People's Hero of Albania that was awarded for heroic deeds, but unlike the latter, was awarded to citizens who contributed to the development of Albania's industry, agriculture, transportation, trade, science and technology and promoted the might and the glory of Albania.
Knowledge 1: Warsaw Pact
The Warsaw Treaty's organization was two-fold: the Political Consultative Committee handled political matters, and the Combined Command of Pact Armed Forces controlled the assigned multi-national forces, with headquarters in Warsaw, Poland. Furthermore, the Supreme Commander of the Unified Armed Forces of the Warsaw Treaty Organization which commands and controls all the military forces of the member countries was also a First Deputy Minister of Defense of the USSR, and the Chief of Combined Staff of the Unified Armed Forces of the Warsaw Treaty Organization was also a First Deputy Chief of the General Staff of the Armed Forces of the USSR. Therefore, although ostensibly an international collective security alliance, the USSR dominated the Warsaw Treaty armed forces. [SEP] Knowledge 2: Russian Soviet Federative Socialist Republic
On October 11, 1944, the Tuvan People's Republic joined the Russian SFSR as the Tuvan Autonomous Oblast, in 1961 becoming an Autonomous Soviet Socialist Republic. [SEP] Knowledge 3: Hero of Socialist Labour (Albania)
Hero of Socialist Labour () was an honorary title in Albania and other Warsaw Pact countries. It was the highest degree of distinction for exceptional achievements in national economy and culture. It provided a similar status to the title People's Hero of Albania that was awarded for heroic deeds, but unlike the latter, was awarded to citizens who contributed to the development of Albania's industry, agriculture, transportation, trade, science and technology and promoted the might and the glory of Albania.
Knowledge 1: Hero of Socialist Labour (Albania)
Hero of Socialist Labour () was an honorary title in Albania and other Warsaw Pact countries. It was the highest degree of distinction for exceptional achievements in national economy and culture. It provided a similar status to the title People's Hero of Albania that was awarded for heroic deeds, but unlike the latter, was awarded to citizens who contributed to the development of Albania's industry, agriculture, transportation, trade, science and technology and promoted the might and the glory of Albania. [SEP] Knowledge 2: Warsaw Pact
The Warsaw Treaty's organization was two-fold: the Political Consultative Committee handled political matters, and the Combined Command of Pact Armed Forces controlled the assigned multi-national forces, with headquarters in Warsaw, Poland. Furthermore, the Supreme Commander of the Unified Armed Forces of the Warsaw Treaty Organization which commands and controls all the military forces of the member countries was also a First Deputy Minister of Defense of the USSR, and the Chief of Combined Staff of the Unified Armed Forces of the Warsaw Treaty Organization was also a First Deputy Chief of the General Staff of the Armed Forces of the USSR. Therefore, although ostensibly an international collective security alliance, the USSR dominated the Warsaw Treaty armed forces. [SEP] Knowledge 3: Allies of World War II
At the start of the war on 1 September 1939, the Allies consisted of France, Poland and the United Kingdom, as well as their dependent states, such as British India. Within days they were joined by the independent Dominions of the British Commonwealth: Australia, Canada, New Zealand and South Africa. After the start of the German invasion of North Europe until the Balkan Campaign, the Netherlands, Belgium, Greece, and Yugoslavia joined the Allies. After first having cooperated with Germany in invading Poland whilst remaining neutral in the Allied - Axis conflict, the Soviet Union perforce joined the Allies in June 1941 after being invaded by Germany. The United States provided war materiel and money all along, and officially joined in December 1941 after the Japanese attack on Pearl Harbor. China had already been in a prolonged war with Japan since the Marco Polo Bridge Incident of 1937, but officially joined the Allies in 1941.

Answer: June 1941