I don't see what those graphs tell us that we don't know already, The first one shows historic unemployment rates. The second shows that corporate tax rates dropped after the Trump tax giveaway.
However, by looking at the two graphs, one fact does stand out. Prior to 2017, unemployment rates during the Trump administration had been dropping steadily by about 0.1% a year. After 2017, they continued to drop at the exact same rate--which suggests that the Trump corporate giveaway had no positive effect at all on unemployment. The benefits of the Obama economy continued as before, until, of course, the pandemic hit.
It should also be noted that during the Obama administration, unemployment fell on an average of 0.6% a year. Trump actually slowed that down substantially, and his tax giveaway did nothing to change it. So, so much for the Tucker Carlson crowd's claim that the Orange Turd did so much for the working man.
What happened was that the big corporations took their windfall and used it to fatten themselves up--with stock buybacks. The massive expansion and hiring boom that Republicans assured us would happen never materialized. According to Republican dogma, the tax breaks should have resulted in MORE AMURRICAN JOBZ. But that didn't happen; all that occurred was a continuation of the prior Trump years' modest unemployment reductions.