What is the story behind maiden tower in istanbul?

It literally means "Maiden's Tower" in Turkish. The name comes from a legend: the Byzantine emperor heard a prophecy telling him that his beloved daughter would die at the age of 18 by a snake. So he decided to put her in this tower built on a rock on the Bosphorus isolated from the land thus no snake could kill her.

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.