Because they knew that Germans could sink any ship they want. They could sink civilian ships. Back then, the only way to travel long distances was by boat, because passenger airplanes had not been invented. The Germans could now sink them if they wanted to travel somewhere, so they either risk their life or not go on trips.
Adding political cartoons. some people couldnt read (some immigrants, slaves, poor people) so the addition of political cartoons increases their coverage because more people are able to absorb the information
Answer:
Started to create there own government and create there own nation.
Explanation:
