How does unionization density in the U$.$S$.$ compares to that in

Northern Europe?

Unionization density in the U$.$S$.$ is much higher than in Northern Europe

Unionization density is in the U$.$S$.$ is about the same as in Northern

Europe

Unionization density in the U$.$S$.$ is much lower than in Northern Europe

Unionization density in manufacturing industry in the U$.$S$.$ is higher in

the U$.$S$.$ than it in manufacturing industry in Northern Europe