虽然，美国一直受益于“大熔炉 ” （ 奥巴马总统的内阁确实代表了更广泛的族群背景）的文化背景，但美国主流社会一直对外来移民进入权力中心保持警惕。
For, although the US has drawn strength from the ideal of a “melting pot” – and President Barack Obama’s cabinet does represent a new high-water mark for diversity – Americans have often shown a xenophobic distrust of immigrants who have drawn too close to power.