Can someone summarize this in 4-6 sentences?

Before Civil War, the United States had a voting system that was exclusive for white people. Shortly after Civil War, Congress allowed universal male suffrage by the Military Reconstruction Act of 1867 which was ratified one year later with the 14th Amendment. In the following years voting was allowed regardless of the race, color o previous conditions of servitude by the 15th Amendment, Enforcement Act of 1870 and the Force Act of 1871. As a result, the former Confederate States where black citizens were majority, were able to vote and to register to be candidates as well.

according to hess's theory, when the magma cooled, it would expand and push the tectonic plates apart. it would push the north and south america plates to the west and eurasia and africa ones to the east. the atlantic ocean would get wider but the coastlines of the masses would stay the same.

harry hammond hess was a geologist and a united states navy officer in the second world war. he is considered to be one of the founding fathers of the theory of plate tectonics. he is known for his theories on sea floor spreading, stating that the movement of the continents was the result of see floor spreading. the continents are attached to the plates and do not move separately. the plates themselves shift and change shape, carrying the continents along.