:) Roman empire failed after 1500 years. Portuguese Empire failed after 584 years. Khmer empire failed 630 years. Kush Empire failed after 1420 years. Sill

:) Roman empire failed after 1500 years. Portuguese Empire failed after 584 years. Khmer empire failed 630 years. Kush Empire failed after 1420 years. Silla Empire failed after 980 years Holy Roman empire failed after 838 years Kanem Empire failed after 676 years. Chinese empire failed after 2000 years. I asked my friend what's the connection between all these Civilizations? He told me "Empire." What a stupid answer. The connection is "failure." You know what hasn't failed! The United States of America that's what!