Question: When did Austria-Hungary annex the de jure Ottoman province of Bosnia and Herzegovina?
About the article "Balkan Wars", section "Young Turk revolution".

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It is no surprise that the "Young Turk" revolution occurred in the troubled European provinces of the Empire.
There the threat to its integrity was the most pronounced, and the need for reforms was most evident.
When the revolt broke out, it was supported by intellectuals, the army, and almost all the ethnic minorities of the Empire, and forced Sultan Abdul Hamid II to re-adopt the long defunct Ottoman constitution of 1876, ushering in the Second Constitutional Era.
Hopes were raised among the Balkan ethnicities of reforms and autonomy, and elections were held to form a representative, multi-ethnic, Ottoman parliament.
However, following the Sultan's attempted counter-coup, the liberal element of the Young Turks was sidelined and the nationalist element became dominant.
At the same time, in October 1908, Austria-Hungary seized the opportunity of the Ottoman political upheaval to annex the "de jure" Ottoman province of Bosnia and Herzegovina, which it had occupied since 1878 (see "Bosnian Crisis"), and Bulgaria declared itself a fully independent kingdom.
The Greeks of the autonomous Cretan State proclaimed unification with Greece, though the opposition of the Great Powers prevented the latter action from taking practical effect.
The historical origin of the enclave on the territory of Serbia is little known, but is believed to date back the Congress of Berlin 1878 when Austria-Hungary was allowed to annex Bosnia and Herzegovina from the Ottoman Empire, and due to ownership relations from that period, the enclave of Sastavci came to be. 
The "de jure" independence of Bulgaria (, "Nezavisimost na Balgaria") from the Ottoman Empire was proclaimed on in the old Bulgarian capital Tarnovo by Prince (Knyaz) (afterwards Tsar) Ferdinand of Bulgaria.
Bulgaria has been Europe's tenth oldest country by continuous sovereignty since that date.
Bulgaria had been a widely autonomous ("de facto" independent) principality since , when it was liberated from Ottoman rule in the wake of the Russo-Turkish War of 1877–1878.
On 6 September 1885, it had unified with the Bulgarian-majority Ottoman autonomous province of Eastern Rumelia.
After the Liberation, Bulgaria's main external goal was the unification of all Bulgarian-inhabited areas under foreign rule into a single Bulgarian state: the main targets of Bulgarian irredentism are Macedonia and southern Thrace, which continued to be part of the Ottoman realm.
In order to join an anti-Ottoman alliance and claim those territories by war, however, Bulgaria had to proclaim its independence first.
This would constitute a violation of the Treaty of Berlin's terms, an act unlikely to be approved by the Great Powers.
The chaos that ensued in the Ottoman Empire following the Young Turk Revolution of 1908 provided suitable conditions for the Bulgarian proclamation of independence.
Many of the Great Powers had also abandoned their support for the Ottomans, looking for territorial gains instead: Austria-Hungary was hoping to annex Bosnia and Herzegovina, the United Kingdom was looking to seize the empire's Arab territories in the east, and the Russian Empire's main target was control over the Turkish Straits.
In September 1908 at a meeting in Buchlov (, contemporary Czech Republic), envoys of Austria-Hungary and Russia supported each other's plans and agreed not to hinder Bulgaria's proclamation of independence which was likely to take place.
Towards the middle of September, the democratic government of Aleksandar Malinov had decided that the suitable moment was near.
, Ferdinand arrived at Rousse from a break in his Hungarian mansion.
He was awaited there by the government to discuss the final decision on board the "Krum" ship.
The delegation then took the train to Tarnovo, where the official proclamation would take place.
According to recent research, it was at the Dve Mogili railway station that the manifesto of independence was completed on .
The independence of Bulgaria was formally proclaimed at the SS.
Forty Martyrs Church in Tarnovo.
As a result, Bulgaria's status was promoted to that of a kingdom, increasing its international prestige.
Ferdinand would adopt the title of Tsar instead of a Knyaz and the country would be ready to join the Balkan League and fight the Ottoman Empire in the First Balkan War of 1912–1913.
Bulgaria's declaration of independence was followed by Austria-Hungary's annexation of Bosnia the following day and Greece's union with the Cretan State (unrecognized until 1913).
With the two countries' joint violation of the Treaty of Berlin and the dominant support among European countries, the independence of Bulgaria was internationally recognized by the spring of 1909.
The Ottoman Empire did not demand any financial compensation from Bulgaria because Russia cancelled the Ottomans' outstanding reparations for the war of 1877–1878.
Bulgaria, however, did have to pay 82 million francs to Russia as a consequence.
The de jure independence is celebrated annually on 22 September as Bulgaria's Independence Day.
On 22 September 2008, Bulgaria celebrated the centenary anniversary of its independence. 
Bosnia and Herzegovina fell under Austro-Hungarian rule in 1878 when the Congress of Berlin approved the occupation of the Bosnia Vilayet, which officially remained part of the Ottoman Empire.
Three decades later, in 1908, Austria-Hungary provoked the Bosnian crisis by formally annexing the occupatied zone.
It was placed under the joint control of Austria and Hungary. 
The Herzegovina Uprising of 1875–1877 (, ) was an uprising led by ethnic Serbs against the Ottoman Empire, firstly and predominantly in Herzegovina (hence its name) from where it spread into Bosnia.
It is the most significant of the rebellions against Ottoman rule in Herzegovina.
The uprising was precipitated by the harsh treatment under the beys and aghas of the Ottoman province (vilayet) of Bosnia — the reforms announced by the Turkish Sultan Abdülmecid I, involving new rights for Christian subjects, a new basis for army conscription, and an end to the much-hated system of tax-farming, were either resisted or ignored by the powerful Bosnian landowners.
They frequently resorted to more repressive measures against their Christian subjects.
The tax burden on Christian peasants constantly increased.
The rebels were aided with weapons and volunteers from the Principalities of Montenegro and Serbia, whose governments eventually jointly declared war on the Ottomans on 18 June 1876, leading to the Serbo-Turkish War (1876–78) and Montenegrin–Ottoman War (1876–78), which in turn led to the Russo-Turkish War (1877–78) and Great Eastern Crisis.
A result of the uprisings and wars was the Berlin Congress in 1878, which gave Montenegro and Serbia independence and territorial expansion, while Austro-Hungary occupied Bosnia and Herzegovina for 30 years, while it still was "de jure" Ottoman territory.