Answer:
The alliance system
Explanation:
German government's guarantee to offer aid to Austria-Hungary, and Russia's danger to counter if Austria-Hungary attacked Serbia made the alliance together framework and instrument for animosity. As proven by the evidence, the hostility between certain powers was uncontrollable therefore causing the outbreak of WW1.
The Constitutional Convention was held for the reason to discuss possible improvements to the Articles of Confederation. It took place in Philadelphia on May 14, 1787.
A. Members of political parties who expected to earn government jobs from their party's elected office holders.