What cities took the lead in the revival of trade?

Explanation:

Once the 11th century rolled around, however, trade began to pick up again. It was mostly Italian cities that started to trade more frequently.Venice was one of the key cities in this revival. It was close with cities in the Byzantine Empire in terms of trade, and the people of Venice decided to start trading on a large scale.

powers  are  denied  to the  national governmentin three distinct ways: some  powers, such as the  power  to levy duties on exports or prohibit the freedom of religion, speech, press, or assembly, are expressly  denied  to the  national government  in the  constitution.