They both hate the 4th of July. England because it reminds him of how America left him, and America because it symbolizes the end of their family. They will now never be able to reconnect and be brothers as they were before. They both have sad memories of the Revolutionary War. America hates Iggy for not wanting him to let him go, and England for America wanting to leave in the first place. They both hate the 4th of July. Too many bad memories...