Many African-Americans and others were reeling on Friday following Thursday’s FBI announcement that it is investigating racist text messages sent to numerous people in several states, asking them to report to a plantation for slave duty. “The FBI is aware of the offensive and racist text messages sent to individuals around the country and is in contact with the Justice Department and other federal authorities on the matter, the agency said on Thursday. The messages were sent the week of the US presidential election, which was on Tuesday. The head of the well-known Black civil rights organizati…