I would say, person vs society since the Depression was caused by a collapse of the capitalist system in the 1930's and as usual the most downtrodden at any time in this case the black rural workers were the ones who suffered the most due to now work and no income coupled with discrimination.
The novel to kill a mockingbird came at a crucial time in american history in which (segregation) and (racism) were fueling debates across the country.
