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

        i'm fairly sure that the correct answers are 2 and 3.

        i used both my knowledge of world history and the process of elimination to obtain these answers. option 1 cannot be a possible selection because the mandate of heaven belongs to ancient chinese philosophical belief. option 4 sounds like it would benefit the region than detriment it. however, both 2 and 3 explain a potential reason for what could have contributed to the fall of the roman empire.

      hope this ! if i were you, i'd get a second opinion, because i haven't taken this course for a year. best of luck!

***websites that me understand the curriculum better last year are and ***

a variant spelling of the word dote (british)