Question: When did the country chosen as the fifth member of BRICS, declare war on Germany?

full_context: Document 1: BRICS: In 2010, South Africa began efforts to join the BRIC grouping, and the process for its formal admission began in August of that year. South Africa officially became a member nation on 24 December 2010, after being formally invited by China to join and subsequently accepted by other BRIC countries. The group was renamed BRICS – with the "S" standing for South Africa – to reflect the group's expanded membership. In April 2011, the President of South Africa, Jacob Zuma, attended the 2011 BRICS summit in Sanya, China, as a full member.
Document 2: World War II: The Empire of Japan aimed to dominate Asia and the Pacific and was already at war with the Republic of China in 1937, but the world war is generally said to have begun on 1 September 1939 with the invasion of Poland by Nazi Germany and subsequent declarations of war on Germany by France and the United Kingdom. Supplied by the Soviet Union, from late 1939 to early 1941, in a series of campaigns and treaties, Germany conquered or controlled much of continental Europe, and formed the Axis alliance with Italy and Japan. Under the Molotov -- Ribbentrop Pact of August 1939, Germany and the Soviet Union partitioned and annexed territories of their European neighbours, Poland, Finland, Romania and the Baltic states. The war continued primarily between the European Axis powers and the coalition of the United Kingdom and the British Commonwealth, with campaigns including the North Africa and East Africa campaigns, the aerial Battle of Britain, the Blitz bombing campaign, and the Balkan Campaign, as well as the long - running Battle of the Atlantic. On 22 June 1941, the European Axis powers launched an invasion of the Soviet Union, opening the largest land theatre of war in history, which trapped the major part of the Axis military forces into a war of attrition. In December 1941, Japan attacked the United States and European colonies in the Pacific Ocean, and quickly conquered much of the Western Pacific.
Document 3: Group of Eight: The forum originated with a 1975 summit hosted by France that brought together representatives of six governments: France, Germany, Italy, Japan, the United Kingdom, and the United States, thus leading to the name Group of Six or G6. The summit came to be known as the Group of Seven, or G7, in 1976 with the addition of Canada. Russia was added to the political forum from 1997, which the following year became known as the G8. In March 2014 Russia was suspended following the annexation of Crimea, whereupon the group's name reverted to the G7. Certain representatives of G7 countries stated that they would be interested in Russia's return to the group. However, in 2017 Russia announced that it would permanently leave the political forum G8. The European Union was represented at the G8 since the 1980s as a ``nonenumerated ''participant, but originally could not host or chair summits. The 40th summit was the first time the European Union was able to host and chair a summit. Collectively, in 2012 the G8 nations comprised 50.1 percent of 2012 global nominal GDP and 40.9 percent of global GDP (PPP).
Document 4: 7th BRICS summit: 7th BRICS Summit VII саммит БРИКС Host country Russia Date 8 -- 9 July 2015 Cities Ufa, Bashkortostan Participants BRICS Follows 6th BRICS summit Precedes 8th BRICS summit Website en.brics2015.ru
Document 5: Southern Europe: The Nazi regime under Adolf Hitler came to power in 1933, and along with Mussolini's Italy sought to gain control of the continent by the Second World War. Following the Allied victory in the Second World War, Europe was divided by the Iron Curtain. The countries in Southeastern Europe were dominated by the Soviet Union and became communist states. The major non-communist Southern European countries joined a US-led military alliance (NATO) and formed the European Economic Community amongst themselves. The countries in the Soviet sphere of influence joined the military alliance known as the Warsaw Pact and the economic bloc called Comecon. Yugoslavia was neutal.
Document 6: Military history of Australia during World War II: Australia entered World War II on 3 September 1939, following the government's acceptance of the United Kingdom's declaration of war on Nazi Germany. Following attacks on Allied countries, the Australian government later declared war on other members of the Axis powers, including the Kingdom of Italy (11 June 1940) and the Empire of Japan (8 December 1941). By the end of the war, almost a million Australians had served in the armed forces, whose military units fought primarily in the European theatre, North African campaign, and the South West Pacific theatre. In addition, Australia came under direct attack for the first time in its post-colonial history. Its casualties from enemy action during the war were 27,073 killed and 23,477 wounded.
Document 7: 9th BRICS summit: The 2017 BRICS summit was the ninth annual BRICS summit, an international relations conference attended by the heads of state or heads of government of the five member states Brazil, Russia, India, China and South Africa. The summit was held in Xiamen, China, the second time the China has hosted the summit after the 2011 summit.
Document 8: Declarations of war during World War II: The Declaration of war by France and the United Kingdom was given on 3 September 1939, after German forces invaded Poland. Despite the speech being the official announcement of both France and the United Kingdom, the speech was given by the British Prime Minister Neville Chamberlain, in Westminster, London.
Document 9: Military history of South Africa during World War II: On 4 September 1939, the United Party caucus refused to accept Hertzog's stance of neutrality in World War II and deposed him in favour of Smuts. Upon becoming Prime Minister, Smuts declared South Africa officially at war with Germany and the Axis. He immediately set about fortifying South Africa against any possible German sea invasion because of South Africa's global strategic importance controlling the long sea route around the Cape of Good Hope.
Document 10: Walter Bergman: When World War II broke out in 1939, Bergmann sought to join the South African army, but as he felt his name was too German-sounding (there was significant anti-German feeling as the war loomed, and as the Nazi persecution of the Jews and the Holocaust had not yet happened, this feeling made no distinction between Germans and German Jews), he removed the second "n" from his name, adopting the Dutch variation of the surname.
Document 11: San Marino: During World War II, San Marino remained neutral, although it was wrongly reported in an article from The New York Times that it had declared war on the United Kingdom on 17 September 1940.  The Sammarinese government later transmitted a message to the British government stating that they had not declared war on the United Kingdom.Three days after the fall of Benito Mussolini in Italy, PFS rule collapsed and the new government declared neutrality in the conflict. The Fascists regained power on 1 April 1944 but kept neutrality intact. Despite that, on 26 June 1944, San Marino was bombed by the Royal Air Force, in the belief that San Marino had been overrun by German forces and was being used to amass stores and ammunition. The Sammarinese government declared on the same day that no military installations or equipment were located on its territory, and that no belligerent forces had been allowed to enter. San Marino accepted thousands of civilian refugees when Allied forces went over the Gothic Line. In September 1944, it was briefly occupied by German forces, who were defeated by Allied forces in the Battle of San Marino.
Document 12: 10th BRICS summit: The 2018 BRICS summit is the tenth annual BRICS summit, an international relations conference attended by the heads of state or heads of government of the five member states Brazil, Russia, India, China and South Africa. The summit was held in Johannesburg, South Africa, the second time the South Africa has hosted the summit after the 2013 summit. This years theme 'BRICS in Africa'.
Document 13: BRICS: BRICS is the acronym for an association of five major emerging national economies: Brazil, Russia, India, China and South Africa. Originally the first four were grouped as ``BRIC ''(or`` the BRICs''), before the induction of South Africa in 2010. The BRICS members are all leading developing or newly industrialized countries, but they are distinguished by their large, sometimes fast - growing economies and significant influence on regional affairs; all five are G - 20 members. Since 2009, the BRICS nations have met annually at formal summits. China hosted the 9th BRICS summit in Xiamen on September 3rd, 4th and 5th, 2017. The term does not include countries such as South Korea, Mexico and Turkey for which other acronyms and group associations were later created.
Document 14: Nigeria: As of 2015[update], Nigeria is the world's 20th largest economy, worth more than $500 billion and $1 trillion in terms of nominal GDP and purchasing power parity respectively. It overtook South Africa to become Africa's largest economy in 2014. Also, the debt-to-GDP ratio is only 11 percent, which is 8 percent below the 2012 ratio. Nigeria is considered to be an emerging market by the World Bank; It has been identified as a regional power on the African continent, a middle power in international affairs, and has also been identified as an emerging global power. Nigeria is a member of the MINT group of countries, which are widely seen as the globe's next "BRIC-like" economies. It is also listed among the "Next Eleven" economies set to become among the biggest in the world. Nigeria is a founding member of the Commonwealth of Nations, the African Union, OPEC, and the United Nations amongst other international organisations.
Document 15: Group of Eight: The forum originated with a 1975 summit hosted by France that brought together representatives of six governments: France, Germany, Italy, Japan, the United Kingdom, and the United States, thus leading to the name Group of Six or G6. The summit came to be known as the Group of Seven, or G7, in 1976 with the addition of Canada. Russia was added to the political forum from 1997, which the following year became known as the G8. In March 2014 Russia was suspended following the annexation of Crimea, whereupon the group's name reverted to the G7. Certain representatives of G7 countries stated that they would be interested in Russia's return to the group. However in 2017 Russia announced that it would permanently leave the political forum G8. The European Union was represented at the G8 since the 1980s as a ``nonenumerated ''participant, but originally could not host or chair summits. The 40th summit was the first time the European Union was able to host and chair a summit. Collectively, in 2012 the G8 nations comprised 50.1 percent of 2012 global nominal GDP and 40.9 percent of global GDP (PPP).
ground_truth: September 1939
sub_queries: who has been chosen as the fifth country of brics Answer: South Africa
when did South Africa declare war on germany Answer: September 1939