Final answer:
White settlers were not held accountable for their environmentally destructive farming practices, justified their actions with Manifest Destiny, and often received governmental support that marginalized groups did not.
Step-by-step explanation:
According to Mackenzie, as discussed by Blaikie, white settlers were not held accountable for the environmentally destructive impact of their farming. The historical context provided shows that white settlers engaged extensively in activities that altered the environment to suit their agricultural and homesteading needs, often with a disregard for the long-term environmental effects. Practices included the clearing of old-growth forests for farming and the use of harmful mining techniques. Moreover, white settlers justified their actions under the notion of Manifest Destiny and were often afforded governmental support in the form of loans or subsidies, unlike marginalized groups who faced systemic barriers and environmental racism.