There are four different blood types: type-O, type-A, type-B and type-AB. Type-O, the most common, is known as the universal donor because any person can receive a blood transfer of type-O blood. Type AB is known as the universal receiver because type-AB can receive a blood transfer of any type of blood.
Jean Baptiste Point du Sable, an immigrant from Saint-Domingue (now the Republic of Haiti), founded the first nonindigenous settlement in what is now Chicago, Illinois, the third largest city in the United States. The state of Illinois and city of Chicago declared du Sable the founder of Chicago on 26 October 1968.
Self-liberated slaves destroyed slavery at home, fought to preserve their freedom, and with the collaboration of mulattoes, founded the sovereign state of Haiti. It led to the greatest slave uprising since Spartacus, who led an unsuccessful revolt against the Roman Republic nearly 1,900 years prior. The Haitian Revolution was the only slave uprising that led to the founding of a state free from slavery and ruled by non-whites and former captives.