Decline of the Ottoman Empire

What were the Causes for the Decline of the Ottoman Empire?

I.  Corruption and conservatism among the Janissaries:  the Ottoman sultans used slaves as administrators in the far-flung parts of their empire.  The slaves were Christian boys given to the empire to be converted and then trained as loyal and capable government administrators.
 
II.  European economic competition:  After the Portuguese seized Hormuz (a port on the Persian Gulf) in 1507, commercial activity for Europeans shifted from the Mediterranean Sea to the Atlantic Ocean.  Therefore, trade between Europe and the Ottoman Empire declined as did the tax revenues for the Ottomans.  Caravan merchants between Egypt and Iraq turned to raiding villages.  Disease and malnutrition increased as resources dwindled.  After decades of trying but failing to break the Portuguese hold on Indian Ocean trade, the Ottomans signed a treaty with the French in 1536 to promote commerce again with Europe.  Finally, the Ottomans realized that drastic measures were needed, and they gave the same capitulations to French, British, and Dutch merchants that they had previously only offered to the Italians.  Capitulations gave European merchants self-rule in their areas of ports or cities and tax-exempt status.  Obviously, capitulations also diminished the tax revenue of the Ottoman empire.
 
III.  Conservative religious leaders (ulama):  Conservatism in the Ottoman Empire kept it from modernizing successfully in the 19th C.  The ulamas wanted their madrasas (schools) to keep their focus on religious instruction not technical or European topics.  The Janissaries had traditionally been allies of the ulamas and rarely carried out modernizing orders that came from the sultan.  Moreover, there were Muslim religious fraternities that slowed progressive change.  These fraternities were dervish orders derived from the Sufi sect of Islam, named for the suf, an undyed woolen garment worn by many early Muslim mystics to symbolize their noninvolvement in struggles for wealth and power.  The dervish orders practiced rites like singing or dancing, during which they entered an ecstatic state in which they felt themselves to be in communion with Allah.  Therefore, the Muslim religious communities for the most part kept the Ottoman Empire from modernizing their transportation, public works, and educational systems that would have helped them compete with 19th C. Europe.
 
IV.  Upset of the balance of power in the ruling class:  One of the modernizing attempts by the Ottoman sultan in the 19th C. was to change the legal and tax systems.  These attempts failed not only because of conservative forces, but also because of corruption.  Previously, non-Muslims had benefited from the capitulation system and resisted the efforts of the Ottoman sultan to declare all subjects in the empire equally subject to taxation and a universal penal code based on that in France.  The tax collection system also was changed to lessen the corruption  of tax "farmers" who previously had kept a share of the taxes collected to a centrally administered bureaucracy, but the tax "farmers" were reluctant to give up their lucrative jobs.
 
V.  Economic Weaknesses:  The Ottoman Empire in the 19th C.  collected smaller amounts of taxes as the economy continued to fail to compete with the industrialized European nations.  As the sultans tried to modernize, they had to borrow funds from European banks to pay for improvements in public works and transportation networks (e.g. the famous Berlin to Baghdad railroad).  The Ottoman Empire came to be dominated by European collection agencies like the British "Ottoman Debt Administration".
 
VI.  Nationalism Among Non-Muslim, Non-Turkish Minorities:  The many wars with Russia also put a strain on Ottoman finances and on the loyalties of non-Muslim, non-Turkish minorities.  Beginning with Greece in 1829, groups began fighting for the right to create their own nation-states.  Soon, Serbia, Montenegro, Rumania, Bulgaria, Egypt, and Iraq all were separated from the Ottoman Empire.