Thomas malthus didn't account for what in his theory

The five tribe’s economy shifted in many ways, which of the following changes is not an example of how they assimilated? a. many tribes began to herd animals and build plantations. b. tribes began to use bartering to trade with others. c. at stores and trading posts, tribes used us currency to trade. d. women began to focus on weaving and spinning to make cloth.

Which statement regarding the distribution of wealth by the mid-19th century is most accurate?

What event brought the us into wwii? what conflicts happened after the us entered the war? i know the first part of this question, i need with the second part.