It looks like the cartoon is sort of mocking the Nazis. Or comparing it to America. You can tell my the symbol of the dude on the right’s shirt..
Answer: They had most of the worlds supply of trade. They also had crops and lots of harvest.
I don’t think so, look somewhere else
Is was about getting revenge for the Arch Duke Franz Ferdinand yet many countries has peace treatise with many others so they all attacked one one-another