Which was the major cause for the entry of the u. s into world war 1?

Which events are correlated but do not necessarily have a causal relationship?

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

The north was victorious in the battle of bull run true or false