How were the Europeans able to succeed and gain in the process of slavery?

Do you believe that unity of purpose and belief are what made the american colonies strong, or do you believe that societies whose citizens were compelled to interact with people of differing beliefs were the most successful, based on the history

Which events are correlated but do not necessarily have a causal relationship?

Following archduke franz ferdinand's assassination, austro-hungarian leaders: a. aided the ottoman empire in its campaign to keep serbia under its control. b. executed nearly all prominent serbs living in austria-hungary c. threatened to invade serbia if serb leaders did not agree to a set of strict demands. d.. formed an alliance with great britain to protect austria-hungary from future attacks.