This sure is a hard question.....
They had a lot of cotton that was needed to make clotheing. Although I don't remember much of the industrial revolution, I know this. it's best you listen to other answers as well to put the pieces together.
Answer:
they provided the explanation on the evolution of man and calculating how long long the processes took place until now
This was the period of time before WW2 and the US was very isolationist and had minimal foreign affairs. World peace was also at hand with the formation of the League of Nations
