How did the constitutional congress of 1787 in the period immediately following deal with the issue of the debate between those who supported a strong central government and those who wanted more power given to the states?

What was unification difficult to accomplish in both germany and italy? a.) weaker states we’re attacked by stronger states for control of the emerging nations. b.) major european powers fought to keep independent states under their control. c.) germans and italians did not share common histories and languages.