Uniform Commercial Code (UCC): Federal law governing commercial transactions, particularly Article 2 which regulates the sale of goods. Each state may have its own UCC adaptations.

Interstate Commerce Laws: Federal regulations that apply when transactions cross state lines, affecting interstate trade and commerce.

Federal Consumer Protection Laws: Laws designed to protect consumers from unfair practices and ensure fair trade practices in the marketplace.

Truth in Lending Act: Federal law requiring disclosure of credit terms and financing details in consumer credit transactions.

FIRPTA: Foreign Investment in Real Property Tax Act - Applies when foreign parties are involved in U.S. real estate transactions.

State Contract Laws: State-specific regulations governing contract formation, enforcement, and remedies.

State Property Laws: Laws governing real and personal property rights, transfers, and obligations specific to each state.

State Licensing Requirements: State-specific permits and licenses needed to conduct certain types of sales or business transactions.

State Warranty Laws: State-specific regulations regarding express and implied warranties in sales transactions.

Statute of Frauds: Legal requirement that certain contracts must be in writing to be enforceable, including real estate transactions and goods over $500.

Recording Requirements: Legal requirements for documenting and recording property transfers with appropriate government offices.

Local Zoning Laws: Municipal regulations affecting property use and transfer, particularly relevant in real estate transactions.

Tax Regulations: Federal, state, and local tax implications and requirements for purchase and sale transactions.

Environmental Regulations: Federal and state environmental laws affecting property transfers and use, including disclosure requirements.

Industry-Specific Regulations: Specialized rules and requirements that apply to particular types of goods or industries involved in the transaction.