” So 90% of the manufacturing jobs outsourced were non union jobs.”
Huh? How did you jump from the fact that today 10% of US Mfg is union, to 90% of off-shored Mfg was nonunion?
Those two are unrelated.
IF a factory closes in the USA today and re-opens in China tomorrow there is a mathematical 90% chance that the USA workers laid off were non union. It is just math.