Manufacturing is the the worst its been in 9 years? Really? How are you measuring this? By number of US Manufacturing jobs? Well that doesn't line up. In 2010 there were 11,460 manufacturing jobs, in 2020 there were 12,851.
What about by growth in those jobs? Does that line up? Hmmm not really. From 2014 through 2015, the percentage change from the prior year was less than 2.5% growth, then in 2016 (Obama's last year), growth wen to zero, in fact just below zero (meaning less jobs than the previous year). At the start of 2017 (Trumps first year) thru 2019, growth was again positive, close to 2.5%. Now in 2020, the percentage is dropping again close to zero (there are still jobs being created in manufacturing, but at a slower pace).
What we see here, upon actually looking at the data, is that you are full of crap.
https://fred.stlouisfed.org/series/MANEMP#0