For use in USA
Having the right legal documentation can go a long way to control legal risk, and the US contracts section of the ContractStore website is intended to provide a number of the most common commercial contracts, designed to conform to US laws.
In the United States, state laws govern many aspects of commercial relationships. These laws tend to be substantially similar across the country though they do vary from state to state.
Most states follow some variation of English common law.
However, Louisiana stands out in this respect, as it bases parts of its commercial and other laws on the civil codes rather than on the common law.
We have notes on signing contracts under USA laws here: http://www.contractstore.com/signing-contracts-usa
When in doubt about a contract in America, it is imperative to consult with competent legal counsel admitted in the state in question.