Answer:
The Japanese soldier is depicted as a ruthless killer attacking a defenceless american citizen. This poster and stories of Japanese soldiers abusing American prisoners impacts the audience of US citizens by making them angry and outraged towards Japanese soldiers.
I'm no expert but considering the only other country capable of reaching it at the time was Portugal, who was focused on Africa, by the time Portugal arrived in Brazil Spain already dominated the carribean basin, England and France wouldnt arrive for a long time so it was pretty much just Spain, Spain and Portugal had also agreed how to split the findings in the new world
One that that historiography suggests about history is that history will always be open to interpretation.
