what is the roosevelt corollary? what did it strengthen?

answer:

to preclude european intervention, in december the roosevelt corollary asserted a right of the united states to intervene in order to "stabilize" the economic affairs of small states in the caribbean and central america if they were unable to pay their international debts

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.