Some may have called the united states a failed experiment after the civil war. why?

The U.S was called a failed experiment after the civil war given the cloud that hang about its future. This is particularly in the aftermath of the assassination of Lincln which put his Reconstruction plan in jitters prompting such a dim view

its whatever your mind tells you

both believe in many god or polytheism

both built temples that they worshiped in both civilization's god were humanoid

both groups made religion a large portion of their lives

both believe in one religion throughout

the dead were buried with items for the afterlife