question: In 1863 , why was Aboriginal population declining ?
answer: diseases , particularly smallpox , frontier violence and dispossession from their lands .
turker_answer: In 1863 , Aboriginal population was declining because of diseases , particularly smallpox , frontier violence and dispossession from their lands .
rule-based: In 1863 , Aboriginal population was declining because of diseases , particularly smallpox , frontier violence and dispossession from their lands .