Why was Vietnam’s physical geography a problem for the US?

Reason i shouldnt turn back if i'm lost in the wilderness need fast

What must happen for new french words to be published in official dictionaries? a. they must be approved by the french academy b. they must be voted on by the people of france c. they must be used by famous french writers d. they must be used by philosophers a. they must be approved by the french academy

How do you think the different landforms of northern and southern europe would affect ways of life in those two areas