Why were Italian city-states so economically prosperous? They produced a lot of gold.
They imported more goods than they exported.
They were important centers of trade with the East and the Byzantine Empire.
They had a greater diversity of people.

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the main reason the us senate rejected the treaty of versailles was because "european nations wanted to punish germany"

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in mcculloch v. maryland (1819) the supreme court ruled that congress had implied powers under the necessary and proper clause of article i, section 8 of the constitution to create the second bank of the united states and that the state of maryland lacked the power to tax the bank.

gibbons v. ogden, (1824), was a landmark decision in which the supreme court of the united states held that the power to regulate interstate commerce, granted to congress by the commerce clause of the united states constitution, encompassed the power to regulate navigation.