In the study of history, what is one major difference between a region and a
period?

A region refers to the geographical areas traditionally associated with a people, society or nation with specific features that are manifested in cultural elements of an area, especially the language and architecture, and with which its inhabitants identify during a historical time determined. On the other hand, the period is the chronological division used to tell and separate the historical time of humanity. The periodization is the study of the General History of Humanity that usually divides human history, by convention and exclusively for didactic purposes

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for this case we have the following equation:

we apply distributive property to the terms within parentheses.

subtracting 2 on both sides of the equation:

it increased the power of the king of england.