It seems that you missed the given choices of the question posted, but anyway, here is the correct answer. The correct answer for the given question above would be SEPARATION OF POWER. The principle of government that is presented by the U.S Constitution in Montesquieu describing is the separation of power. Hope this answer helps.
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Mesopotamia (from the Greek, meaning 'between two rivers') was an ancient region located in the eastern Mediterranean bounded in the northeast by the Zagros Mountains and in the southeast by the Arabian Plateau, corresponding to today's Iraq, mostly, but also parts of modern-day Iran, Syria and Turkey.
The Law of April 6, 1830 was issued because of the Mier y Terán Report to counter concerns that Mexican Texas, part of the border state of Coahuila y Tejas was in danger of being annexed by the United States. It also outlawed slavery in Texas.