What is the ""unfinished"" work or ""great task remaining before"" the american people?

They have to finish what they started: Win the war,unite as a Union and end slavery.

Explanation: The American civil war was a war that started in the year 1861, it took place as a result of tension about the abolition of Slavery,the war took place between the Northern American states and the Southern American States. In the 19th century the Northern American states were very prosperous as they were more industrialised with many industries while the southern states were mainly filled with farmers who do large scale farmers, the southern states don't want the Slavery to be stopped while the Northern States are working for the abolition of the slave trade

b) a state law could be declared illegal if it contradicted the constitution.

explanation:

the conflict of this case originated when james w. mcculloch, a cashier of the baltimore branch of the second bank of the united states that the congress had chartered in 1816, refused to pay a tax imposed by the maryland state.

in the case, the state of maryland appealed that the establishment of a second bank was unconstitutional since the constitution didn't say anything about granting that power to congress. however, the case determined that even if such right wasn't specifically stated in the constitution, it was part of the "implied powers" of the government enunciated in article i, section 8.

the case also eliminated maryland's legislation to impose taxes to a national bank, asserting that even though the states retained the power of taxation, the constitution's laws are supreme and can not be controlled by the states, therefore, if a state law contradicts the constitution, it should be declared illegal.

explanation:

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