What was the main target of german submarines in world war ii?

What is the definition of double v campaign

Why were factories a good source of income? select all that apply. -they produce goods at an exceptionally fast pace. -they build a sense of community among workers. -they often employed low wage earners. -they employed women and children at disgracefully low wages. -labor unions to establish good working conditions.

Apurging of emotions, specially pity and fear