What was one success during the reconstruction era?

Explanation:  hold the nation together

Reconstruction, in U.S. history, is the period (1865–77) that followed the American Civil War and during which attempts were made to redress the inequities of slavery and its political, social, and economic legacy and to solve the problems arising from the readmission to the Union of the 11 states that had seceded at or before the outbreak of war. .

Many African Americans participated in new state and local governments, which worked for equal rights.  Holding the nation together  was a success

the triple alliance. germany and austria-hungary were already allies by 1879 when, worried about a threat from russia, they formed the dual alliance. italy joined the group in 1882. there was a concern about a possible attack from france and the alliance needed powerful friends to defend it.