How did mercantilism affect europe?

What was the main argument of plessy in plessy v. ferguson

What was unification difficult to accomplish in both germany and italy? a.) weaker states we’re attacked by stronger states for control of the emerging nations. b.) major european powers fought to keep independent states under their control. c.) germans and italians did not share common histories and languages.

What new concept did the the american revolution introduce into the world