It is interesting also to note an attempt made by one of the expert statisticians attached to the Guaranty Trust Company of New York to estimate the total cost of the war at the close of the four-year period. The five main Allies possessed, before the war, $406,000,000,000 for national work, a sum nearly four times as great as the national wealth of the two Central Powers. In four years the seven leading belligerents had spent $134,000,000,000. The only way to grasp the meaning of this enormous sum is to contrast the cost of the World War with all former wars. The total cost of wars that had taken place since the American Revolution was $23,000,000,000; the World War costs therefore, are six times greater. In these figures, staggering as they are, it was comparatively easy to figure out the costs, debts and interests of actual war expenditures. Much more complicated is the problem of estimating the property value destroyed through military operations on land and sea: LOSS FROM DESTRUCTION OF PROPERTY "The total area of the war zone is 174,000 square miles, of which the Western theater of the war, in France and Belgium, stretches over an area of 19,500 square miles, and it contains over 3,000 cities, villages, and hamlets, great manufacturing and agricultural districts, of which some have been totally annihilated and some heavily affected. The estimate by the National Foreign Trade Council of the war losses, which unfortunately does not go beyond 1916, is as follows: "'Destruction of buildings and industrial machinery in Belgium, $1,000,000,000, and in France $700,000,000. The destruction of agricultural buildings and implements, of raw materials, of crops and live stock, has been estimated at a sum of $780,000,000 in Belgium and $680,000,000 in France. Roads were destroyed frequently by the retreating troops and have been seriously damaged by heavy gun fire and excessive use. The losses from destruction of railway bridges, etc., have been estimated in Belgium at $275,000,000 and in France at $300,000,000. "'In the Eastern theater of the War Germany has been invaded only in eastern Prussia, where the agricultural population has been seriously impaired. Heavy damage was inflicted upon bridges, roads, and governmental property, including railroads. The direct cost to Germany through the loss of agricultural products, of manufacturing products, as well as in interest on investments abroad, of earnings from shipping and banking houses, and profits of insurance and mercantile houses engaged in business abroad has been enormous'." ECONOMIC LOSS OF MAN-POWER The same expert goes on to figure out the economic value of the loss of human life: