Final answer:
The social impact described involves unequal land distribution favoring corporations and ranches, leading to land disputes due to the lack of access for poor settlers.
Step-by-step explanation:
The social impact described in the text pertains to how corporations and large ranches, with their greater access to capital, are able to secure land farther from major highways than poor settlers. As a result, this unequal distribution of land and resources often leads to small farmers claiming land only within proximity to public roads or even invading privately claimed lands, which consequently results in land disputes. These conditions reflect the broader historical patterns of wealth inequality and social stratification affecting land ownership and economic opportunities in frontier regions.