Answer:
The main reason was the revolt of his army. Fearing the prospect of facing other large armies and exhausted by years of campaigning, Alexander's army mutinied at the Hyphasis River (Beas), refusing to march farther east.
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Thomas Jefferson believed in a strict interpretation of the Constitution. Jefferson thought that what powers were not specifically stated in the Constitution belonged to the states and the people. Ultimately, it was the job of the people to keep the federal government in check.
Answer: An ecumenical council is a conference of ecclesiastical dignitaries and theological experts convened to discuss and settle matters of Church doctrine and practice in which those entitled to vote are convoked from the whole world and which secures the approbation of the whole Church.