[Restorer]

Nationalism, of course, has long been a dirty word. It is generally deemed to have consigned Europe to almost continuous war between the early 19th century and the mid-20th century.

The author is a moron. There were very few European wars between 1815 and 1914.

Lots of posturing and threatening, and massive expenditures on the military, especially towards the end of this period, but only a few actual wars between nations.

Certainly there were a lot fewer European wars than in the 18th or 17th centuries, when warfare was indeed almost continuous, but unfortunately for the writer's theory is generally considered to be pre-nationalism.

And there were only two major European wars in the 20th century, both fought in a 30 year period. To be fair, they were very large wars, but there were only two of them. (If you discount various squabbles that were essentially after-shocks of WWI.)

[Restorer]

Even stretching the definition, I can come up with only eight wars between European states between 1815 and 1914.

Every one, with the exception of the Crimean War, grew out of the German and Italian struggles for unification.

There were many wars during this period, but only a few in Europe.

[Democratshavenobrains]

There were many small scale wars in Europe between 1815 and 1914. They mostly had to do with German or Italian unification or nationalism if you prefer. But they didn't last longer than a few months at a time, much unlike previous decade long wars between France and England and Spain.

[avacado]

"Nationalism, of course, has long been a dirty word. It is generally deemed to have consigned Europe to almost continuous war between the early 19th century and the mid-20th century.

The author is a moron. There were very few European wars between 1815 and 1914.

He said up to the mid-20th century. That includes WWI and WWII.

[PzLdr]

Aside from Russia and Turkey: Crimean War, War between Prussia and Austria, Franco-Prussian War, war for independence [Greece], Balkan Wars vs. Ottoman Empire, Swedish occupation of Norway, Wars of Italian Unification [Savoy & France v. Austria-Hungary].

There's been more than a few.