All the wrong-doers got it comin' back to 'em a thousand times over
Every dog has it's day and everythin' flips around
Even the most greatest nation in the world has it coming back to em
Everybody reaps what they sews, that's how it goes

from Nas – What Goes Around Lyrics on Rap Genius

Meaning

Even USA had 9/11 coming back to it because its government is a wrong-doer

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