Answer:
Under support from the British and the initiative of Portugal, Otto von Bismarck, the chancellor of Germany, called on representatives of 13 nations in Europe as well as the United States to take part in the Berlin Conference in 1884 to work out a joint policy on the African continent. The Berlin conference included 13 European powers and the United States. They were Austria Hungary, Belgium, Denmark, France, Germany, Italy, Netherlands, Ottoman Empire, Portugal, Russia, Spain, Spain, Sweden- Norway, United Kingdom, and the United States.
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