The supremacy law that establishes the federal government establishes that the state governments must be subordinate to the federal authority. In line with this law, whenever the interests of the federal government collide with those of state governments, the interest of federal government shall always supersede.
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since the 1800s theres been a lot of rebelius uprisings on the balkans expecialy in the begining of the 1900s(Ilinden Uprising) then the Ottoman Empire was at war (First Bakan War 1911-12) with Montenegro(started the war), Serbia, Macedonia, Bugaria and Greece in 1913(2nd Balkan war) Greece, Serbia, and Bugaria divided Macedonia Greece took Aegon Macedonia Serbia took Vardar Macedonia Bugaria(stared the war) took Pirin Macedonia(smalest part) ---- Ottoman Empire, after 1700s had to maintain status quo for falling technologicaly and economicaly apart from European counterparts. Diplomaticaly it could have lost its existence long time ago if England and France did not prevent Russia from further advancing. However at the last times of the empire English left supporting and Italy invaded Tripoli, at that time with Russian support Balkan Wars began which was probably the greatest defeat of Ottoman Empire, by the countries it ruled for 4 centuries directly or as vassals. As nobody wanted to ally with Ottoman Empire, Germany was only country that was interested in allying. Great German aid was made, in both army and industry. Construction of Istanbul-Baghdad railroad was also maintained by German industry. Under this pro-German aids Ottoman Empire sought to gain its old power, at least on Balkans, which was so close to its capital and were highly populated by Turkish population. Note: By the Ottoman official records 2,5 million immigrants came from newly founded countries which is a real high number as Turkish population of Ottoman Empire was about 10 millions before WW1.
Invasive species of flora and fauna and communicable diseases were a byproduct of the Colombian Exchange
The Cold War border between democratic Western Europe and Communist Eastern Europe
