Why was a new state constitution written in 1876

How was the government that was created at the constitutional convention similar to the one proposed in the virginia plan?

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 and why did british north american colonists fight a revolution to create a constitutional republic, the united states of america?