Yep. 1870-1871. Big Prussian win. Not to mention the following:
1864 Second Schleswig War
1866 Austro-Prussian War
18661869 Cretan Revolt
1867 Fenian Rising
18701871 Franco-Prussian War
18721876 Third Carlist War
18731874 Cantonal Revolution
187577 Herzegovina Uprising (187577)
187678 Serbo-Turkish War (187678)
187678 Montenegrin-Ottoman War (1876-1878)
18771878 RussoTurkish War
1878 Epirus Revolt of 1878
1885 Serbo-Bulgarian War
1897 GrecoTurkish War
Napoleon marched through Germany and Poland to attack Russia. He marched through Spain to attack Portugal. He attacked Egypt.
Kaiser Wilhelm marched through Belgium to attack France, and through Poland to attack Russia. England attacked Turkey at Gallipoli.
Wars change borders when neighbors fight.
Wars change the world when armies travel vast distances to fight.
And let’s not forget the Crimean War.
The Russo-Turkish War was also a major war that, like the Franco-Prussian War (introduction of machine guns), showed how more modern weapons would turn land war into a meatgrinder. The Russo-Turkish War was the first major war showing the supplantation of Napoleonic muzzle-loaders by modern breechloading and lever-action rifles.
There was no shortage of tea leaves to sift in any of these major regional wars.