The constitutional principle that was utilized commonly in both Hammer v. Dagenhart (1918) and McCulloch v. Maryland (1819) can be considered as Supremacy Clause.
Supremacy Clause shows that the federal constitution, and federal law normally, accept priority over state laws, and consistent state constitutions.
Maryland lacked the ability to tax the Bank because, pursuant to the Supremacy Clause of Article VI of the Constitution, the laws of the United States trump contradicting state laws.
Therefore, the Supremacy Clause fits as the most powerful law in a certain country.
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