The document discusses different modes of transporting goods globally, including railroads, roadways, ships, and airplanes. It notes that some countries have more extensive railroad and road networks than others due to factors like population density and land area. While the US has fewer roadways per area than other nations, its roads are used heavily for domestic transport. Shipping is another important method, with some countries owning larger fleets that can transport more cargo by tonnage. Air freight has more recently become significant, with major airports handling millions of tons annually in addition to passenger traffic.