history of bulgaria - World War I
In the aftermath of the Balkan Wars, Bulgarian opinion turned against Russia and the western powers, whom the Bulgarians felt had done nothing to help them. The government of Vasil Radoslavov aligned Bulgaria with the German Empire and Austria-Hungary, even though this meant becoming an ally of the Ottomans, Bulgaria's traditional enemy. But Bulgaria now had no claims against the Ottomans, whereas Serbia, Greece and Romania (allies of Britain and France) held lands perceived in Bulgaria as Bulgarian.

Bulgaria sat out the first year of World War I, recuperating from the Balkan Wars. But when Germany promised to restore the boundaries of the Treaty of San Stefano, Bulgaria, which had the largest army in the Balkans, declared war on Serbia in October 1915. Britain, France and Italy then declared war on Bulgaria.

In alliance with Germany, Austria-Hungary and the Ottomans, Bulgaria won military victories against Serbia and Romania, occupying much of Macedonia (taking Skopje in October), advancing into Greek Macedonia, and taking Dobruja from Romania in September 1916.

But the war soon became unpopular with most Bulgarians, who suffered great economic hardship and also disliked fighting their fellow Orthodox Christians in alliance with the Muslim Ottomans. The Agrarian Party leader, Aleksandur Stamboliyski, was imprisoned for his opposition to the war. The Russian Revolution of February 1917 had a great effect in Bulgaria, spreading antiwar and anti-monarchist sentiment among the troops and in the cities. In June Radoslavov's government resigned. Mutinies broke out in the army, Stamboliyski was released and a republic was proclaimed.

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