If you did expand the chard, you might find that democrat presidents have usually reduced unemployment while unemployment increased under republican presidents. And you don't need me to look that up for you.Just shows you that someone can manipulate data to show anything they want .... It had leveled off under Obama ... Minorities didn't improve much under Obama .... Under Trump it went lower than any time in 50 years and for minorities lower than ever in history .... If that chart was extended about 40 years into the past it might have better perspective.
I don't give a rats arse what you find important in an election, nor are historic trends a guarantee that the next republican president will increase unemployment again, who knows, there is always the possibility that you get a good one again.