How many Africans did not survive on the slave ships?

Surviving records suggest that until the 1750s one in five Africans on board ship died. Some European governments, such as the British and French, introduced laws to control conditions on board. They reduced the numbers of people allowed on board and required a surgeon to be carried.

Explanation:

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the president of russia is head of state, and of a multi-party system with executive power exercised by the government, headed by the prime minister, who is appointed by the president with the parliament's approval.

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the northwest ordinance of 1787 guaranteed basic rights for settlers and banned slavery there.