What two german actions caused the united states to enter world war 1?
a) attack on belgium, the use of poisonous gas
b) the zimmerman note, submarine warfare
c) their confiscation of contraband, the sinking of lusitania
d) the blockade against great britain, the invasion of france

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.

a. by accepting the election of president abraham lincoln in 1860 and convincing other southern states to do the same