Thus it was the interplay of these economic, political, and social factors and forces that led to the scramble for Africa and the frenzied attempts by European commercial, military, and political agents to declare and establish a stake in different parts of the continent through inter-imperialist commercial competition, the declaration of exclusive claims to particular territories for trade, the imposition of tariffs against other European traders, and claims to exclusive control of ...
As general advice: RoofCoatingScam does not recommend regular roof cleaning just for the sake of improving the appearance of the roof. Foot traffic can damage roof tiles so we only recommend roof cleaning/de-mossing when it is absolutely necessary, ie when the moss is preventing water from draining off the roof.
Roof-A-Cide is just cheap Copper Sulfate. The roof still has to be cleaned first and is usually done by pressure washing, ins pite of what Roof-A-Cide claims. The work is all basically sub-contracted out to pressure washing companies. Here in Venice, Fl the Roof-A-Cide guy is Hoover PRESSURE CLEANING.