Hourly wages in Germany are not that different from the US. Depends a bit on how exactly to compare - nominal, PPP, net/gross, etc.: e.g., average nominal is about 10% higher in the US, real median is higher in Germnay, ...
Overlooking that we are comparing the richest EU state to all 50 US states, doesn't that further the point that having unions is are at best uninfluential.
>median is higher in Germnay
I cannot think of any standard by which this is true, certainly not by nominal or PPP income for either personal or household income.
[1]https://en.wikipedia.org/wiki/Median_income
[2]https://worldpopulationreview.com/country-rankings/median-in...