15 U.S.C. § 3001 - U.S. Code - Unannotated Title 15. Commerce and Trade § 3001. Congressional findings and policy

(1) the States should have the primary responsibility for determining what forms of gambling may legally take place within their borders;

(2) the Federal Government should prevent interference by one State with the gambling policies of another, and should act to protect identifiable national interests; and

(3) in the limited area of interstate off-track wagering on horseraces, there is a need for Federal action to ensure States will continue to cooperate with one another in the acceptance of legal interstate wagers.