What was the primary difference between the control and experimental groups in this experiment?

What motivated germany to make an alliance with austria-hungary?   a.  fear of aggression from the united states      b.  fear of aggression from france      c.  the desire to invade russia      d.  fear of aggression from england

Which two important economic activities in the west are possible because of the united states natural resources

Which two activities did soldiers carry out as a part of their routine during the civil war? taking care of horses training slaves educating women cleaning weapons