What is one of the effects of the napoleonic wars

The Napoleonic wars had great repercussions on the European continent:

In many countries of Europe, the importation of the idealisms of the French Revolution (democracy, fair trials in the courts, abolition of privileged rights, etc.) left a profound impact. Although Napoleon's rules were authoritarian, they were certainly less arbitrary and authoritarian than those of the previous monarchs (or those of the Jacobins and the Directory regime during the Revolution). The European monarchs found serious difficulties to replenish the prerevolutionary absolutism, and were forced in many cases to maintain some of the reforms induced by the occupation. The institutional legacy has remained until today. Many European countries have a system of civil laws, with a legal code clearly influenced by the Napoleonic code.

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.