What is best examples of a Regional or Civilizational history?

As its name implies, the Regional history seeks to study the history of particular regions rather than analyze the great civilizations traditionally studied by common history. ... In some cases, they also had to do with events or specific situations to those regions which had an important meaning in the events of the same.

Explanation:

8 - (2a + 7) = a + 40     distribute/multiply - into (2a + 7)

8 - 2a - 7 = a + 40

1 - 2a = a + 40       add 2a on both sides

1 = 3a + 40         subtract 40 on both sides

-39 = 3a       divide 3 on both sides

-13 = a

[proof]

8 - (2a + 7) = a + 40

8 - (2(-13) + 7) = -13 + 40

8 - (-26 + 7) = 27

8 - (-19) = 27

8 + 19 = 27

27 = 27

immigrants from northern and western europe continued coming as they had for three centuries, but in decreasing numbers