Question: What did Bloomberg name the country formerly known as the region where the Spanish and Portuguese took most of their slaves from?

Passages:
In the British West Indian islands (and also in the United States), the majority of enslaved blacks brought across the Atlantic came from West Africa (roughly between modern Senegal and Ghana). Very little of Bermuda's original black emigration came from this area. The first blacks to arrive in Bermuda in any numbers were free blacks from Spanish-speaking areas of the West Indies, and most of the remainder were recently enslaved Africans captured from the Spanish and Portuguese. As Spain and Portugal sourced most of their slaves from South-West Africa (the Portuguese through ports in modern-day Angola; the Spanish purchased most of their African slaves from Portuguese traders, and from Arabs whose slave trading was centred in Zanzibar). Genetic studies have consequently shown that the African ancestry of black Bermudians (other than those resulting from recent immigration from the British West Indian islands) is largely from the a band across southern Africa, from Angola to Mozambique, which is similar to what is revealed in Latin America, but distinctly different from the blacks of the West Indies and the United States. Under the terms of the concluding Treaty of Versailles signed in 1919, the empire reached its greatest extent with the addition of 1,800,000 square miles (4,700,000 km2) and 13 million new subjects. The colonies of Germany and the Ottoman Empire were distributed to the Allied powers as League of Nations mandates. Britain gained control of Palestine, Transjordan, Iraq, parts of Cameroon and Togo, and Tanganyika. The Dominions themselves also acquired mandates of their own: the Union of South Africa gained South-West Africa (modern-day Namibia), Australia gained German New Guinea, and New Zealand Western Samoa. Nauru was made a combined mandate of Britain and the two Pacific Dominions. In 2013, global business and financial news provider, Bloomberg, named Namibia the top emerging market economy in Africa and the 13th best in the world. Only four African countries made the Top 20 Emerging Markets list in the March 2013 issue of Bloomberg Markets magazine, and Namibia was rated ahead of Morocco (19th), South Africa (15th) and Zambia (14th). Worldwide, Namibia also fared better than Hungary, Brazil and Mexico. Bloomberg Markets magazine ranked the top 20 based on more than a dozen criteria. The data came from Bloomberg's own financial-market statistics, IMF forecasts and the World Bank. The countries were also rated on areas of particular interest to foreign investors: the ease of doing business, the perceived level of corruption and economic freedom. In order to attract foreign investment, the government has made improvement in reducing red tape resulted from excessive government regulations making the country one of the least bureaucratic places to do business in the region. However, facilitation payments are occasionally demanded by customs due to cumbersome and costly customs procedures. Namibia is also classified as an Upper Middle Income country by the World Bank, and ranks 87th out of 185 economies in terms of ease of doing business.

Supporting sentences:
As Spain and Portugal sourced most of their slaves from South-West Africa (the Portuguese through ports in modern-day Angola; the Spanish purchased most of their African slaves from Portuguese traders, and from Arabs whose slave trading was centred in Zanzibar). The Dominions themselves also acquired mandates of their own: the Union of South Africa gained South-West Africa (modern-day Namibia), Australia gained German New Guinea, and New Zealand Western Samoa. In 2013, global business and financial news provider, Bloomberg, named Namibia the top emerging market economy in Africa and the 13th best in the world.