What were the cost of these restrictions for world war 2?

What was the downward filtration theory? What country in the world produces the most coal? What were some of the reasons the allies won World War 1 and the central powers lost? What materials were used to build the Calgary Tower? Where did the pound sterling symbol originate? When was William Jansz born? What problems threatened peace after world war 1? Where did raw materials flow i the triangular trade? Can food technology be traced back through history? What were popular girl names in 1200? How is the guillotine important part of world history? 'Why is The Glorious Revolution considered glorious? Did Ben Hall have a nickname? What nation did silk come from? What country's exploration was David Livingstone most known for? Who is the greatest explorer the world has ever known? What are the two names of the major river in southern china? What treaty ended the Russian participation in World War 1? What does 'World War 2' or 'W.W. 2' mean? Is Robert de la salle a positive or negative explorer?