No, a contract cannot supersede the law. The law always takes precedence over any agreements made in a contract.
It will likely be based on case law /presedence in the state of enforcement.
No, it would mean the contract was illegal to begin with. Government laws supersede anything your employment could make you sign. No judge is going to say, "You get to go free because you signed a contract to commit a crime".
Federal law to supersede state law.
If the specific law is, in fact, more applicable to the situation it will generally prevail.
This contract supersedes and replaces any previous terms and conditions that were agreed upon between the parties involved.
Most all governing documents can supersede state law in common interest communities, if they are reasonable. Best practices dictate that the association consult with association counsel to determine how applicable and enforceable a specific by-law may be.
No, local case law, common law, or statutes cannot supersede the U.S. Constitution. The Constitution is the supreme law of the land, as established by the Supremacy Clause in Article VI. Any local law or statute that conflicts with the Constitution is deemed unconstitutional and invalid. Courts have the authority to review and strike down such conflicting laws to uphold constitutional principles.
It would not be a valid contract. A contract to break the law is illegal.
Private laws are those that do not apply to everyone. An example of private law is a contract. As long as it is not illegal, you can contract for many things or you contract away your rights.
Generally, the action would involve breach of contract.
Contract law is a large and complex area of the law. You can find a summary of the main principles of contract law by visiting the Wikipedia page titled English contract law.
Contract law is just a body of law regarding... well... contracts.