但是美国最高法院一再裁定州不能抵消或违反联邦法律 — — 南部一些州在20世纪中叶抵制学校种族融合时曾要求享有这类权利。
But the US Supreme Court has repeatedly ruled that states may not nullify or contravene federal law – a right some southern states claimed in the mid-twentieth century to resist school integration.