No Plebiscites for Germans, 1919

From The War of the World: Twentieth-Century Conflict and the Descent of the West, by Niall Ferguson (Penguin Press, 2006), pp. 160-161:

Applying the principle of self-determination proved far from easy, however, for two reasons. First, ... there were more than thirteen million Germans already living east of the borders of the pre-war Reich – perhaps as much as a fifth of the total German-speaking population of Europe. If self-determination were applied rigorously Germany might well end up bigger, which was certainly not the intention of Wilson's fellow peacemakers. From the outset, then, there had to be inconsistency, if not hypocrisy, in the way Germany was treated: no Anschluss of the rump Austria to the Reich – despite the fact that the post-revolutionary governments in both Berlin and Vienna voted for it – and no vote at all for the 250,000 South Tyroleans, 90 per cent of whom were Germans, on whether they wanted to become Italian, but plebiscites to determine the fate of northern Schleswig (which went to Denmark), eastern Upper Silesia (to Poland) and Eupen-Malmédy (to Belgium). France reclaimed Alsace and Lorraine, lost in 1871, despite the fact that barely one in ten of the population were French-speakers. In all, around 3.5 million German-speakers ceased to be German citizens under the terms of the Versailles Treaty. Equally important, under the terms of the 1919 Treaty of St Germain-en-Laye, more than 3.2 million Germans in Bohemia, southern Moravia and the hastily constituted Austrian province of Sudetenland found themselves reluctant citizens of a new state, Czechoslovakia. There were just under three-quarters of a million Germans in the new Poland, the same number again in the mightily enlarged Romania, half a million in the new South Slav kingdom later known as Yugoslavia and another half million in the rump Hungary left over after the Treaty of Trianon.

The second problem for self-determination was that none of the peacemakers saw it as applying to their own empires – only to the empires they had defeated.