[rfreedom4u]

Yep. 1870-1871. Big Prussian win. Not to mention the following:

1864 Second Schleswig War
1866 Austro-Prussian War
1866–1869 Cretan Revolt
1867 Fenian Rising
1870–1871 Franco-Prussian War
1872–1876 Third Carlist War
1873–1874 Cantonal Revolution
1875–77 Herzegovina Uprising (1875–77)
1876–78 Serbo-Turkish War (1876–78)
1876–78 Montenegrin-Ottoman War (1876-1878)
1877–1878 Russo–Turkish War
1878 Epirus Revolt of 1878
1885 Serbo-Bulgarian War
1897 Greco–Turkish War

[ClearCase_guy]

Certainly true. But those wars were generally pretty small, and perhaps in all cases were neighbors fighting neighbors.

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.

[AlaskaErik]

And let’s not forget the Crimean War.

[lentulusgracchus]

The Austro-Prussian War (started by Bismarck) and the Franco-Prussian War were major-power wars that destabilized Europe (German expansion) and led to World War I.

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.