My history teacher said today that the world record of mobilization goes to finland which during the second world war mobilized 700.000 men and women while finlands population then was only 3.7million. Is this true or did some other nation mobilize more of its population?
700,000 seems a bit unrepresentative of the overall size of the Finnish military in WWII. In the Winter War, for example, Finland opposed the Soviets with eight divisions comprising about 130,000 troops. It may be that a total of 700,000 Finns were in uniform between 1939-1945, but this probably includes local defense forces, mobilized defense workers etc.
In WWI, New Zealand fielded over 100,000 troops from a population of one million, out of which about 17,000 were killed and 40,000 wounded (apocryphally, this occurred because New Zealand was mistakenly thought to have a population of ten million).
Just letting you know we have a WWI Megathread today so you may want to consider reposting this there!