THE WORLD TO-DAY 429 'mandatories7. France also received Alsace-Lorraine. The Saar valley was to be administered under a ' mandate' of the League of Nations; it reverted to Germany by a ple- biscite of its people in 1935. On the East, Poland (which had been partitioned between Prussia, Russia, and Austria during the eighteenth century) was reconstituted as an in- dependent state; and a Polish Corridor was created up to Danzig on the Baltic, which port was handed over to the League of Nations. Another new state was created in Bohe- mia, re-christened Czecko-Slovakia, under its famous leader Mazaryk as first President. Austria and Hungary, consi- derably reduced in size, became two independent republics; parts of their territories being shared by Italy in the South and the new Balkan States in the East. Serbia and Mon- tenegro combined to form Jugoslavia, and Roumania was enlarged with the addition of Transylvania. Bulgaria lost her hold on the Aegean and became one of the smallest ot Balkan States. By agreement between Russia and Ger- many, Finland, Esthonia, Latvia, and Lithuania—in the Bal- tic region—were also constituted independent states. Turkey lost much of her remaining territories in Europe as well as Asia, and the Aegean islands. Though Constantinople was left to her, the Straits were demilitarised and interna- tionalised. ' A dozen independent nations now stretched from the eastern Baltic to the Aegean, a veritable mosaic of states from the empires of Germany, Russia, Austria, and Turkey.' The Allies had pompously proclaimed during the War that they were waging ' a war to end war' and * war to vindi- cate the principle of self-determination.* The League of Nations, with its head-quarters at Geneva, was therefore constituted to maintain these ideals. The principle of nation- ality was largely given effect to in the reconstitution of states