Question: How long did the Ottomans control the Balkans?
About the article "Balkan Wars", section "Abstract".

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Fringe territories were lost to Russia in the north.
but more importantly the Empire began to fall behind technologically compared to the west.
The outside world was still mostly unaware of the extent of the Empire's decline until the 1820s, when it became clear that the Ottoman armies had no way to put down the Russian-backed revolt in southern Greece.
The great powers of Europe decided to intervene to give Greece its independence.
Thus Greece became the first independent country created out of a section of the Ottoman Empire.
Russian aspirations for a section of the empire and bases on Russia's southern flank provoked British fears over naval domination of the Mediterranean and control of the land route to India.
When in 1853 Russia destroyed the entire Ottoman fleet at Sinop, Britain and France concluded that armed intervention on the side of the Ottomans was the only way to halt a massive Russian expansion, on the grounds that the Ottoman armies could do nothing to stop a Russian march on Constantinople.
Even though Ottomans and Russians were on the opposing sides, the roots of the ensuing Crimean war lay in the rivalry between the British and the Russians.
The war ended unfavorably for the Russians, with the Paris peace of 1856.
The war brought a decline in Ottoman morale and a feeling of helplessness, illustrating that modern technology and superior weaponry were the most important part of a modern army, and a part that the Ottoman Empire was sorely lacking.
While fighting alongside the British, French, and even the Piedmontese, the Ottomans could see how far they had fallen behind.
It is not surprising then that at the midpoint of the 19th century the Ottoman Empire was at the mercy of the Russians until outside forces intervened.
Things began to change after the Crimean war.
Another change was that Serbia was permanently granted its independent status.
This pleased both Austria, who feared a Serbian revolt on its borders, and Russia who long supported the Slavic nation's independence.
Other changes arose as Europeans for the first time saw the trading opportunity of Turkey.
The amount of money entering the nation through trade was soon dramatically increased.
As well the government received a great deal of extra money from a uniform tax system with little corruption.
The Sultan also managed to get a tighter grip on the provincial beys and increased the tribute they had to pay.
Regrettably Abd-ul-Aziz, the Sultan at the time, used much of this money on furnishing and creating great palaces to rival the great ones in England and France, which he had visited.
The Empire was undergoing a revolution, throughout Anatolia a new Ottoman nationalism was appearing, and for the first time the Empire had a middle class.
It seemed as though it might be possible for the Empire to turn its decline around.
The monetary and governmental collapse combined with a new threat from Russia began the final stages of the Empire's collapse.
Russia had been forced by the Crimean War to give up its ambitions of owning the Ottoman capital of Constantinople and controlling the Bosphorus.
Instead it decided to focus on gaining power in the Balkans.
The population of much of the Balkans were Slavs, as were the Russians.
They also mainly followed the Eastern Orthodox Church, as did the Russians.
When new movements in Russia, such as that of the Slavophiles, started to enter the area, it became agitated and prone to revolution.
When the government in Constantinople tried to initiate measures to prevent an economic collapse throughout the empire, it touched off a revolt in Herzegovina in 1875.
The revolt in Herzegovina, quickly spread to Bosnia and then Bulgaria.
Soon Serbian armies also entered the war against the Turks.
These revolts were the first test of the new Ottoman armies.
Even though they were not up to western European standards the army fought effectively and brutally.
Soon the Balkan rebellions were beginning to falter.
In Europe, however, a new problem was developing.
The papers of Russia were filled with reports of Ottoman soldiers killing thousands of Slavs.
Soon, more than Russian propaganda was moving southwards and in 1877, a new Russo-Turkish war had begun.
Despite fighting better than they ever had before, the advanced Ottoman armies still were not equal to the Russian forces.
This time there was no help from abroad, in truth many European nations supported the Russian war, as long as it did not get too close to Constantinople.
Ten and a half months later when the war had ended the age of Ottoman domination over the Balkans was over.
The Ottomans had fought well, the new navy of Ironclads had won the battle for the Black Sea, and Russian advances in the Caucasus had been kept minimal.
In the Balkans, however, the Russian army, supported by rebels, had pushed the Ottoman army out of Bulgaria, Walachia, Romania, and much of East Rumelia and by the end of the war the artillery firing in Thrace could be heard in Constantinople.
In response to the Russian proximity to the straits the British, against the wishes of the Sultan, intervened in the war.
A large task force representing British naval supremacy entered the straits of Marmara and anchored in view of both the royal palace and the Russian army.
The British may have saved the Ottoman empire once again, but it ended the rosy relations between the two powers that had endured since the Crimean War.
Looking at the prospect of a British entry into the war the Russians decided to settle the dispute.
The treaty of San Stephano gave Romania and Montenegro their independence, Serbia and Russia each received extra territory, Austria was given control over Bosnia, and Bulgaria was given almost complete autonomy.
The hope of the Sultan was that the other great powers would oppose such a one-sided resolution and a conference would be held to revise it.
His desire became reality and in 1878 the Congress of Berlin was held where Germany promised to be an "honest broker" in the treaty's revision.
In the new treaty Bulgarian territory was decreased and the war indemnities were cancelled.
The conference also again hurt Anglo-Ottoman relations by giving the British the island of Cyprus.
While annoyed at British Prime Minister Benjamin Disraeli, the Sultan had nothing but praise for Otto von Bismarck who forced many of the major concessions upon Russia.
These close Germano-Ottoman relations would persist until both empires' very end.
The Russian extension in this century developed with the main theme of supporting independence of Ottomans' former provinces and then bringing all of the Slav peoples of the Balkans under Bulgaria or using Ermenians in the east sets the stage.
At the end of the century from Russian perspective; Romania, Serbia and Montenegro and autonomy of Bulgaria was achieved.
That alarmed the Great Powers.
After the Congress of Berlin the Russian expansion was controlled through stopping the expansion of Bulgaria.
The Russian public felt that at the end of Congress of Berlin thousands of Russian soldiers had died for nothing. 
In the decades leading up to the Congress of Berlin, Russia and the Balkans had been gripped by a movement known as Pan-Slavism, a desire to unite all the Balkan Slavs under one rule.
This movement, which evolved similarly to the Pan-Germanic and Pan-Italian movements that resulted in the unification of their respective nations, took different forms in the various Slavic nations.
In Imperial Russia, Pan-Slavism meant the creation of a unified Slavic state under Russian direction – essentially a byword for Russian conquest of the Balkan peninsula.
The realization of this goal would result in Russia’s controlling of the Dardanelles and the Bosphorus, giving it economic control of the Black Sea and substantially increasing its geopolitical power.
In the Balkans, Pan-Slavism meant unifying the Balkan Slavs under the rule of a particular Balkan state – though which state was meant to serve as the locus for unification was not always clear; initiative waffled between Serbia and Bulgaria.
It is worth remembering that the creation of a Bulgarian Exarch by the Ottomans in 1870 intended to separate the Bulgarians religiously from the Greek Patriarch and politically from Serbia.
From the Balkan point of view, the peninsula needed a Piedmont, and a corresponding France to sponsor its unification.
Though the views of how Balkan politics should proceed differed, both began with the deposition of the Sultan as ruler of the Balkans and the ousting of the Ottomans from Europe.
How this was to proceed, or whether it was to proceed at all, was the major question to be answered at the Congress of Berlin. 
The Republic of Venice controlled areas of the Balkans from the early Middle Ages until 1797.
Venice seized a number of locations on the eastern shores of the Adriatic sea before 1200, partly for purely commercial reasons, but also because pirates based there were a menace to its trade.
The Doge since that time bore the titles of "Duke of Dalmatia" and "Duke of Istria".
In building its maritime commercial empire, the Republic dominated the trade in salt, acquired control of most of the islands in the Aegean, including Cyprus and Crete, and became a major "power" in the Near East and in all the Balkans.
Venice became a fully imperial power following the Venetian-financed Fourth Crusade, which in 1203 captured and in 1204 sacked Constantinople and established the Latin Empire.
Venice subsequently carved out a sphere of influence in the Aegean known as the Duchy of the Archipelago, and also gained control of the island of Crete.
From the 14th century, Venice controlled most of the maritime commerce of the Balkans with important colonial possessions on the Adriatic and Aegean coasts.
Venice's long decline started in the 15th century, when it first made an unsuccessful attempt to hold Thessalonica against the Ottomans (1423–1430).
She also sent ships to help defend Constantinople against the besieging Turks (1453).
After the city fell to Sultan Mehmet II, he declared war on Venice.
The war lasted thirty years and cost Venice many of the eastern Mediterranean possessions.
Slowly the Republic of Venice lost nearly all possessions in the Balkans, maintaining in the 18th century only the Adriatic areas of Istria, Dalmatia and Albania Veneta.
The Venetian island of Corfu was the only area of Greece never occupied by the Turks.
In 1797 Napoleon conquered Venice and caused the end of the Republic of Venice in the Balkans. 
The conquest of the Balkans by the Ottomans set in motion important population movements of Turks brought over from Anatolia and Asia Minor, establishing a firm Turkish base for further conquests in Europe.
Thus, the Ottomans used colonization as a very effective method to consolidate their position and power in the Balkans.
The colonizers that were brought to the Balkans consisted of soldiers, nomads, farmers, artisans and merchants, dervishes, preachers and other religious functionaries, and administrative personnel.
Densely populated Turkish colonies were established in the frontier regions of Thrace, the Maritsa and the Tundzha valleys.
In addition to voluntary migrations, throughout the fourteenth, fifteenth, and sixteenth centuries, the Ottoman authorities also used mass deportations ("sürgün") as a method of control over potentially rebellious individuals.
One of the greatest impacts of the Ottoman colonization process of the Balkans was felt in the urban centres, many towns became major centres for Turkish control and administration, with most Christians gradually withdrawing to the mountains.
The Ottomans embarked on creating new towns and repopulating older towns that had suffered significant population decline and economic dislocation during the wars preceding the Ottoman conquests.
Major Balkan towns, especially those on or near transportation and communication routes, were the focal point of Ottoman colonization in the Balkans.
Most urban centres in the Balkans, especially in Thrace, Macedonia, Thessaly, and Moesia, achieved Muslim/Turkish majorities or substantial minorities soon after the completion of the conquest and remained overwhelmingly Muslim in composition into the eighteenth century, and in some areas such as Macedonia and Bulgaria well into the nineteenth century.
However, in the course of the nineteenth and twentieth centuries, many Turks were displaced, most of them fleeing to Anatolia.
At present, there are still significant Turkish minorities living in Bulgaria, the province of East Macedonia and Thrace in Northern Greece, Kosovo, the Republic of Macedonia, and Romania. 
Things went worse for Byzantium during the civil wars that followed after Andronikos III died.
A six-year long civil war devastated the empire, allowing the Serbian ruler Stefan IV Dushan (r. 1331–1346) to overrun most of the Empire's remaining territory and establish a short-lived "Serbian Empire".
In 1354, an earthquake at Gallipoli devastated the fort, allowing the Ottomans (who were hired as mercenaries during the civil war by John VI Kantakouzenos) to establish themselves in Europe.
By the time the Byzantine civil wars had ended, the Ottomans had defeated the Serbians and subjugated them as vassals.
Following the Battle of Kosovo, much of the Balkans became dominated by the Ottomans.
The Byzantine emperors appealed to the West for help, but the Pope would only consider sending aid in return for a reunion of the Eastern Orthodox Church with the See of Rome.
Church unity was considered, and occasionally accomplished by imperial decree, but the Orthodox citizenry and clergy intensely resented the authority of Rome and the Latin Rite.
Some Western troops arrived to bolster the Christian defence of Constantinople, but most Western rulers, distracted by their own affairs, did nothing as the Ottomans picked apart the remaining Byzantine territories.
Constantinople by this stage was underpopulated and dilapidated.
The population of the city had collapsed so severely that it was now little more than a cluster of villages separated by fields.
On 2 April 1453, Sultan Mehmed's army of some 80,000 men and large numbers of irregulars laid siege to the city.
Despite a desperate last-ditch defence of the city by the massively outnumbered Christian forces (c. 7,000 men, 2,000 of whom were foreign), Constantinople finally fell to the Ottomans after a two-month siege on 29 May 1453.
The last Byzantine Emperor, Constantine XI Palaiologos, was last seen casting off his imperial regalia and throwing himself into hand-to-hand combat after the walls of the city were taken.