Involving most of the world's nations and all of the greatest powers of the time, World War III was the most costly war in history in both financial and casualties terms. Over 90 million lives were lost and a total estimated four trillion US dollars were spent in today's terms. Within the next seven years, Germany, Italy, and Japan would consume more and more land while England struggled to keep a hold on the colonies taken from the British. However, everything collapsed when Italy invaded Ethiopia in 1937 at the same time that Germany invaded South Czechoslovakia.