The answer is b, the destruction of the Berlin wall.
They were segregated and forbidden from doing numerous things because of the jim crow laws. These laws established where they would be able to live and where not, where they would be able to go to school and where not, and in what manner would be they allowed to vote, which usually resulted with them not voting. They was a systematic racism scheme in the south to enable this.
They were found in the south because that's where slavery had been a dominating force and in response to the reconstruction era, the white racist governments from the south imposed numerous laws. Although they couldn't enslave african-american people, they would remove them from all spheres of society completely.
Jim Crow was a character made by white people which showed an african-american person who was depicted as a racial stereotype caricature which spread fast and reinforced the idea that black people were either stupid or are tricksters or are malicious or similar things. The set of laws that reinforced these ideas then was called Jim Crow Laws because of the caricature.
By 1600 England had two clusters of colonies.
It is considered the most significant among the many cultural contributions of the Sumerians and the greatest among those of the Sumerian city of Uruk which advanced the writing of cuneiform
Angola's civil war happened at the time of the Cold War, when the US and Soviet Union fought a number of proxy wars. Angola's war was simialar to those and one of the sides was Marxist-Leninist, so the Soviet Union was bound to support it and the US oppose it.