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What I don't understand, however, is why Islam didn't spread any further to the EAST.
I would say this question can be answered in two words. The Mongols. 8th century to the 14th century, the Islamic world came under significant pressure from one of the most sucessful military expansionist empires the world has ever seen. The Mongols basically up-ended and splintered Islam. They conquered significant population centers in Iraq, Persia, Syria and Turkey, including the seat of Islamic Power, their capital for 500 years, Baghdad (1258). The Islamic golden age basically was snuffed out at it's height with the fall of Baghdad and the sacking of the House of Wisdom.
Mongol invasions and conquests : Middle East
The Mongols conquered, by battle or voluntary surrender, the areas of present-day Iran, Iraq, the Caucasus, and parts of Syria and Turkey, with further Mongol raids reaching southwards into Palestine as far as Gaza in 1260 and 1300. The major battles were the Siege of Baghdad (1258), when the Mongols sacked the city which had been the center of Islamic power for 500 years, and the Battle of Ain Jalut in 1260, when the Muslim Kipchak Mamluks were able to defeat the Mongols in the battle at Ain Jalut in the southern part of the Galileeβthe first time the Mongols had been decisively stopped. One thousand northern Chinese engineer squads accompanied the Mongol Khan Hulagu during his conquest of the Middle East
The Otomman Caliphate which followed successfully conquered the Middle East but never successfully unified Islamic Empire which came before. The Sunni Ottoman's never successfully conquered/rejoined with the Shia Persians for example, see Ottoman Persian Wars(16thβ19th centuries). That's why the Ottoman's never really spread east. The Mongols had left them splintered, and nearly continuous wars fought between Persia and the Turkish Ottomans for three centuries left them preoccupied and without the resources of the unified Caliphate which had come before.
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As most other borders these are results of long, hard centuries of wars, beginning with Islamic conquests. The border on the strait of Gibraltar is the result of 780 years of Reconquista. The borders in Eastern Europe are the result of the Turkish conquest of the Eastern Roman empire, and later conquest of Hungary, with the following almost continuous struggle which ended (or almost ended) only in the 20th century. In Cyprus and Palestine, the tension continues. The equilibrium between India/Pakistan/Bangladesh was reached only during my lifetime, and it is still unstable. The struggle in Africa and China continues. And so on.