Latin America is their branch office. Japan gets richer and unhappier. Russia exports trouble in the form of neoreligious cultists and mafioso. The US and Europe become large theme parks. Of course, categories are only handles.
Real issues entail a bit of all four forces.
The point of listing the driving forces is to look past the everyday crises that typically occupy our minds and to examine the long-term forces that ordinarily work well outside our concerns. It is these powerful forces that will usually catch us unaware. For instance, the number of high school students in California 10 years from now is more or less predetermined by the number of elementary school children now. Not all forces are so evident, or so easy to calculate, but when we build our stories, predetermined elements figure in each one. After we identify the predetermined elements from the list of driving forces, we should be left with a number of uncertainties.