Please, look at the first part.
Cost of the war
World War II's basic statistics qualify it as by far the most costly war in history in terms of human casualties and material resources expended. In all, 61 countries with 1.7 billion people, three-fourths of the world’s population, took part. A total of 110 million people were mobilized for military service, more than half of those by three countries: the USSR (22 million to 30 million), Germany (17 million), and the United States (16 million). For the major participants the largest numbers on duty at any one time were as follows: USSR (12,500,000); United States (12,245,000); Germany (10,938,000); British Empire and Commonwealth (8,720,000); Japan (7,193,000); and China (5,000,000).
Most statistics on the war are only estimates. The war’s vast and chaotic sweep made uniform record keeping impossible. Some governments lost control of the data, and some resorted to manipulating it for political reasons.
A rough consensus has been reached on the total cost of the war. The human cost is estimated at 55 million dead—25 million in the military and 30 million civilians. The amount of money spent has been estimated at more than $1 trillion, which makes World War II more expensive than all other wars combined.
Economic Statistics
The United States spent the most money on the war, an estimated $341 billion, including $50 billion for lend-lease supplies, of which $31 billion went to Britain, $11 billion to the Soviet Union, $5 billion to China, and $3 billion to 35 other countries. Germany was next, with $272 billion; followed by the Soviet Union, $192 billion; and then Britain, $120 billion; Italy, $94 billion; and Japan, $56 billion. Except for the United States, however, and some of the less militarily active Allies, the money spent does not come close to being the war’s true cost. The Soviet government has calculated that the USSR lost 30 percent of its national wealth, while Nazi exactions and looting were of incalculable amounts in the occupied countries. The full cost to Japan has been estimated at $562 billion. In Germany, bombing and shelling had produced 4 billion cu m (5 billion cu yd) of rubble.
Human Losses
Although the human cost of the war was tremendous, casualty figures cannot always be obtained and often vary widely. Most experts estimate the military and civilian losses of Allied forces at 44 million and those of the Axis at 11 million. The total number of civilian losses includes the 5.6 million to 5.9 million Jews who were killed in the Holocaust. Of all the nations that participated in World War II, the human cost of the war fell heaviest on the USSR, for which the official total, military and civilian, is given as more than 20 million killed. The United States, which had no significant civilian losses, sustained more than 400,000 deaths.
Perhaps the most significant casualty over the long term was the world balance of power. Britain, France, Germany, and Japan ceased to be great powers in the traditional military sense, leaving only two, the United States and the Soviet Union.
