Question: When did america declare war on the birth country of Louis Oppenheim?

full_context: Document 1: Military history of the United States during World War II: On 11 December 1941, Adolf Hitler and Nazi Germany declared war against the United States, the same day that the United States declared war on Germany and Italy.
Document 2: United States declaration of war upon Germany (1941): December 11, 1941, the United States Congress declared war upon Germany (Pub. L. 77 -- 331, Sess. 1, ch. 564, 55 Stat. 796), hours after Germany declared war on the United States after the Japanese attack on Pearl Harbor. The vote was 88 -- 0 in the Senate and 393 -- 0 in the House.
Document 3: Hannover Hauptbahnhof: A wooden platform area was built next to the entrance building and on each side of the two tracks. That was enough for the first traffic because the still short trains running to the east and the west stopped at the same platform. There were no through trains initially. The first through train ran from 1 May 1851 between Berlin and Cologne. The first railway workshop was built opposite the station building. In 1853, the opening of the first section of the Southern Railway to Alfeld, Göttingen and Kassel made the through station into a railway junction. A marshalling yard was established in Hainholz to relieve the station in 1868.
Document 4: Koloman Moser: Koloman Moser (; 30 March 1868 – 18 October 1918) was an Austrian artist who exerted considerable influence on twentieth-century graphic art and one of the foremost artists of the Vienna Secession movement and a co-founder of Wiener Werkstätte.
Document 5: German declaration of war against the United States: On 11 December 1941, four days after the Japanese attack on Pearl Harbor and the United States declaration of war against the Japanese Empire, Nazi Germany declared war against the United States, in response to what was claimed to be a series of provocations by the United States government when the US was still officially neutral during World War II. The decision to declare war was made by Adolf Hitler, apparently offhand, almost without consultation. Later that day, the United States declared war on Germany.
Document 6: Railway stations in Coburg: There are six railway stations in the town of Coburg in Bavaria, southern Germany. These include: two passenger stations, three halts and one goods station.
Document 7: Consequences of the attack on Pearl Harbor: On December 8, 1941, Japan declared war on the United States and the British Empire. The Japanese document discussed world peace and the disruptive actions of the United States and the United Kingdom. The document claimed all avenues for averting war had been exhausted by the Government of Japan.
Document 8: Heinrich Bernhard Oppenheim: Heinrich Bernhard Oppenheim (July 20, 1819 in Frankfurt – March 29, 1880 in Berlin) was a German publicist and philosopher concerned with the ideas of liberalism, free trade and international law.
Document 9: Cork (city): Cork was one of the most rail-oriented cities in Ireland, featuring eight stations at various times. The main route, still much the same today, is from Dublin Heuston. Originally terminating on the city's outskirts at Blackpool, the route now reaches the city centre terminus of Kent Station via Glanmire tunnel. Now a through station, the line through Kent connects the towns of Cobh and Midleton east of the city. This also connected to the seaside town of Youghal, until the 1980s.[citation needed]
Document 10: Hannover Hauptbahnhof: In the timetable of summer 1939, Hanover station had a total of 144 scheduled long-distance arrivals and departures. It was the most important junctions on Deutsche Reichsbahn’s long-distance network after the terminal stations of Berlin, Cologne, Frankfurt am Main and the main stations of Leipzig and Duisburg.
Document 11: Kornwestheim station: Kornwestheim station is located in the Ludwigsburg district of Kornwestheim in the German state of Baden-Württemberg. It is located on the Franconia Railway () and is a station on the network of the Stuttgart S-Bahn. It is near the junction of the Untertürkheim–Kornwestheim line ("Schusterbahn") freight bypass. Kornwestheim passenger station was the site of a Deutsche Bahn car train loading facility until December 2007.
Document 12: United States declaration of war on Germany (1917): On April 2, 1917, President Woodrow Wilson asked a special joint session of the United States Congress for a declaration of war against the German Empire. Congress responded with the declaration on April 6.
Document 13: Louis Oppenheim: Born in Coburg, Oppenheim studied in London from 1899 to 1906. He moved to Berlin and started his work as a graphic artist in 1910, signing his work with his initials, "LO" and working for clients such as AES, the Reichsbahn, Persil and Adrema. His posters are considered a significant product of the 'Berlin poster style'. Oppenheim worked for the type foundry Berthold and created a handful of significant and widespread typefaces, all of which share modernist characteristics, such as Lo-Type and Fanfare which are still in wide use today. Also, he designed the first coin of the Weimar Republic in 1919.
Document 14: Wilhelm Wagenfeld: Wilhelm Wagenfeld (15 April 1900, Bremen, Germany — 28 May 1990, Stuttgart, Germany) was an important German industrial designer and former student of the Bauhaus art school. He designed glass and metal works for the Jenaer Glaswerk Schott & Gen., the Vereinigte Lausitzer Glaswerke in Weißwasser, Rosenthal, Braun GmbH and WMF. Some of his designs are still produced to this day.
Document 15: Hermann Muthesius: Adam Gottlieb Hermann Muthesius (20 April 1861 – 29 October 1927), known as Hermann Muthesius, was a German architect, author and diplomat, perhaps best known for promoting many of the ideas of the English Arts and Crafts movement within Germany and for his subsequent influence on early pioneers of German architectural modernism such as the Bauhaus.
ground_truth: 11 December 1941
sub_queries: Louis Oppenheim >> place of birth Answer: Coburg
Railway stations in Coburg >> country Answer: Germany
when did america declare war on Germany in ww2 Answer: 11 December 1941