What is isolationism?

Which of the following statements is true about germany's use of u-boats?

In order to maintain national security within its colonies in america, england constructed a series of forts along colonial boundaries for protection. true false

This is a picture of workers in a factory. why was this picture most likely taken? to advertise that kids could get jobs to expose the horrors of child labor to show pride in children at work to show that night workers were needed o