They could pay slaveholders
As in other parts of Latin America under the system of coartación, slaves could purchase their freedom by negotiating with their master for a purchase price and this was the most common way for slaves to be freed
Thurgood Marshall was the Court's 96th justice and its first African-American justice.
Simone de Beauvoir, a French author who was of great importance to the emergence of the post war women's liberation movement. In 1949, she published her highly influential work, The Second Sex. As a result of male-dominated societies, she argued, women had been defined by their differences from men and consequently received second-class status. Her book influenced both the American and European women's movements.
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It depends on what time period you are referencing with African immigrants. Back in the 1500s, African people came to the Americas because of Slave Trade, but later on, they came to the United States under their own free will. Slave Trade forced African people on ships into the Americas, in which they stayed as slaves or did forced labor in a harsh system.
In the 1900s and later on, African immigrants came to America to seek asylum or safety in the United States because of problems going on in their countries. For example, in Rwanda, in the 1990s, there was some major problems going on such as genocide (mass killing of people) and some people came over to America to escape these hardships.
Also, another way they are different would be their culture that they brought. Their influence of music and African culture was very different as compared to other cultures from Europe.