After the 13 Colonies gained independency from Great Britain, the states remained sovereign and were united by a weak central government under the Articles of Confederation, this is what the Constitutional Convention intended to review.
The Constitutional Convention took place in 1787 in the old Pennsylvania State House. Members of the Constitutional Convention view the relationship between the states and the federal government as a weak government that could not mantain order, and decided that the Articles of Confederation should be replaced in order to obtain a federal government that could mantain order and balance between the states, while they remained free and sovereign. They created three branches (executive, legislative and judicial) so there would not be an abuse of power, and every state could be represented in the federal government.
A political party is an organization that coordinates candidates to compete in a particular country's elections. It is common for the members of a party to hold similar ideas about politics, and parties may promote specific ideological or policy goals.
Rome was able to gain its empire in large part by extending some form of citizenship to many of the people it conquered. Military expansion drove economic development, bringing enslaved people and loot back to Rome.
