Destroyed Europe--the ape is representing Germany and he has taken a lady (representing liberty). He is stepping onto the shores of America with Europe in the background destroyed.
This poster encourages support for US entry into World War I to protect the values of liberty in America. It suggests that Germany is made with power and will not stop with Europe but will continue to the US to destroy America as well.
I think it's called a merit system after the spoils system but I'm not 100% sure
People and goods from Mexico move through the transportation infrastructure including roads, sea and air transport to various destinations around the world. Ideas from Mexico move through communication media including the internet, print media and the broadcast media such as television and radio.
When citizens cast their ballots for president in the popular vote, they elect a slate of electors. Electors then cast the votes that decide who becomes president of the United States. Usually, electoral votes align with the popular vote in an election.
