Why was the Northwest Ordinance of 1787 significant to the residents of the territory that it discussed?

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.

What from the columbian exchange had perhaps the biggest impact on the world?

Which statement is true of both presidential and parliamentary systems of government?