Federal law prevails.
Federal law comes first and then state law as said in the constitution.
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The state law is declared void. States cannot pass a law that conflicts with a Federal Law or the US Constitution. The law could also be illegal based on the state's constitution.
If a state law conflicts with a federal law, the federal law should be followed. This is because the U.S. Constitution establishes federal law as the supreme law of the land, and it takes precedence over state laws in case of a conflict.
In the US Constitution, the Article VI, Section 2, Supremacy Clause declares federal law supersedes state law if the two are in conflict, but it's inaccurate to say the "clause is used to determine if a state law conflicts with federal law." Any part of the Constitution that provides guidelines for a specific law, and applies equally to the state and federal government, may be used to make that determination; the Supremacy Clause simply states if a state law conflicts with federal law, the federal law prevails.
No state can constitutionally have a law that conflicts with national laws. However, amendment can be made to the national constitution to make room for a difference so that a state may pass a law. An example can be the state law banning gay marriage. The Constitution bans the federal government from prohibiting freedom of religion, but it also states that the states reserve the right to govern certain aspects of the law at their own discression.
it is like if one state makes a law an other state does not have to allow itA good example is the United States. The Federal level is composed of the President, the Congress, and the Supreme Court. While Federal Laws do not automatically trump what the states do, they can if state law conflicts with Federal law. This is why slavery and segregation are no longer legal... the Federal government has forbidden the states to have laws allowing for it. Nor can states print their own money or set up tolls on borders to other states.
Federal law prevails.
The U.S. Constitution is the supreme law of the land. In fact, Article VI is referred to as The Supremacy Clause; it states that federal law takes presidence over state law when conflicts between the two occur.
The federal law overrides the state law. The federal government is the "supreme law of the land," meaning that whatever it says goes. For example, a state can pass a law stating that everything has to wear blue jeans on Tuesday. However if the federal government passes a law that everyone has to wear red pants on Tuesday, then everyone in that state and the rest of the country has to wear red pants on Tuesday.
If the state law is stricter/harsher/more limiting, state law takes precedence. If the the state law is more lax/unrestricted, federal law takes precedence.
Yes, that is what a Federal Law is so all states must obey the law.