What was the name of the proposed law that would be slavery in all territory won in mexico america war

“the battle of stalingrad is not a turning point necessarily in strategic terms, because a lot more has to be done before the soviets can be certain of defeating germany,” says renowned world war ii historian richard overy. the germans had fought nearly a thousand miles across the soviet union to get to stalingrad.

which statement explains one of the reasons world war 1 was so much more destructive than earlier conflicts