If you were to write a paper about dialects in the United States, what main topics would you most likely include as reasons for the development of dialects?

climate
topography
spread of literacy
improved communication techniques
economic conditions
social structure
isolation
life forms

Question

If you were to write a paper about dialects in the United States, what main topics would you most likely include as reasons for the development of dialects? 

climate
topography
spread of literacy
improved communication techniques
economic conditions
social structure
isolation
life forms

anonymous · Answer

spread of literacy
improved communication techniques

there may be more, but these two are for sure