What was the basis for the court's ruling that maryland could not tax the second bank of the united states

The ruling in the case of McCullough v. Maryland (1819) was based on the "necessary and proper" clause of Article I, Section 8 of the Constitution of the United States. 

After enumerating a number of the powers of Congress, including borrowing money, coining money, regulating commerce, etc, Section 8 of Article I closes with by saying Congress shall have power "to make all Laws which shall be necessary and proper for carrying into Execution the foregoing Powers, and all other Powers vested by this Constitution in the Government of the United States, or in any Department or Officer thereof."  

Alexander Hamilton had referenced the same constitutional clause when, as Secretary of the Treasury, he sought to establish the First Bank of the United States in 1791. A national bank was not strictly listed as something Congress could establish, but there was nothing in the Constitution to prohibit it.  And the "necessary and proper" clause gave leeway to create such an institution. The First Bank of the United States existed from 1791 till 1811, when its charter expired and was not renewed by Congress. The Second Bank of the United States also existed for a 20-year charter period, from 1816 to 1846.

the french revolution main idea was to give power to the people. the revolution was influenced by the enlightenment ideas, reasoning and skepticism pushed people to revolt against standards and norms in french society.

the problem was that the revolution caused political turmoil, and napoleon saw this as an opportunity and launched a coup d’état in november 1799. he became the first consul of france and later named french emperor.

some people see napoleon as a hero of the revolution and others see him as a traitor.

people see him as a traitor because he noticed the political turmoil and used this moment to rise to power. others see him as a hero of the revolution because he had some political and military achievements - in which he was committed to promoting the achievements of the french revolution - he had extensive public constructions, made a civil reform.

in a bigger picture, napoleon had some huge achievements in france which made him very important, but the fact that he seized power to himself makes him an undeniable traitor to the revolution since the main idea of it was to remove people from power and give power to the people.