Why did it become difficult for republicans to enforce reconstruction?

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.

How was george washington able to defeat the british in the battle of trenton and princeton

The map shows information about river valley civilizations. which feature of this map best the reader determine the distance between two places?