The Federal
Arbitration Act (the Act) makes
arbitration agreements «valid, irrevocable, and enforceable,
save upon such grounds as exist at law or in equity for the revocation of any contract,» 9 U.S.C. ¶ 2, establishes an equal - treatment principle: A court may invalidate an
arbitration agreement based on «generally applicable contract defenses,» but not on legal rules that «apply only to
arbitration or that derive their meaning from the fact that an
agreement to arbitrate is at issue,» AT&T Mobility, LLC v. Concepcion, 563 U.S. 333, 339.