Tariff Act of 1930: Also known as Smoot-Hawley Tariff Act, this is a fundamental law governing U.S. import regulations and customs duties

Trade Facilitation and Trade Enforcement Act of 2015: Modern legislation that strengthens enforcement of U.S. trade laws and facilitates legitimate international trade

Customs Modernization Act: Legislation that modernized U.S. Customs operations and introduced the concepts of 'informed compliance' and 'shared responsibility'

Trade Act of 2002: Law that enhanced U.S. customs processes and introduced new security measures for international trade

CBP Regulations: U.S. Customs and Border Protection rules governing the import process and border security

FDA Requirements: Food and Drug Administration regulations for importing food, drugs, cosmetics, and medical devices

USDA Regulations: Department of Agriculture rules governing the import of agricultural products, plants, and animals

EPA Standards: Environmental Protection Agency requirements for imports that may affect environmental safety

USMCA Requirements: United States-Mexico-Canada Agreement rules governing North American trade

19 CFR: Code of Federal Regulations Title 19 - comprehensive regulations on customs duties and import procedures

Trade Security Act: Legislation focusing on security measures in international trade to prevent terrorism and illegal activities

Bioterrorism Act: Regulations requiring advance notice of food shipments and registration of food facilities

Container Security Initiative: Program requirements for screening and examining containers at foreign ports before shipment to the U.S.

Documentation Retention Rules: Requirements for maintaining import-related records for typically 5 years after importation

Electronic Submission Requirements: Regulations governing electronic filing of import declarations and related documents