I think that line made me pause when first I read it several years ago. It was the gee whiz moment when I realized Kipling was dead serious. Notice how he bastardizes the rhyme between “come” and “Rome”. It forces a pause just because we are expecting a perfect rhyme.
Of course, America since 1965 has "accomplished" what it took Rome about 500 years to accomplish on the road to perdition. God Help us; although to be honest, we do not deserve it. We have betrayed the most manifest of Blessings, following those wonder promising Gods of the Market--now prancing in triumph in Washington.