It would be the economic policy of "mercantilism" that was based on the idea that the American colonies primarily were meant to provide economic benefits for Great Britain, since this philosophy held that trade between two entities benefits mainly the larger entity (in this case Britain), and that it is in that entity's best interest to protect its trading partner (the colonies).
"They were angry at German leaders for losing the war to the Allies" is the best way to sum up how German people felt about their nation after World War I.
What do you need? please explain.