What was the main concern of the environmental movement during the progressive era?

The protection and the preservation of nature.

Explanation:

The modern-day environmental campaign in the United States started in the 1960s and 1970s. This campaign was basically centered on a few noticeable environmental concerns and failures. Environmentalism emerged to enhance a multifaceted campaign in the United States. In the mid to late 19th century, tangible resources were massively employed, particularly in the West. Land theorists and developers exerted over large stretches of woodlands and grazing land. Property significant to waterpower was enclosed by private interests. Mining companies followed inappropriate and destructive mining applications.

The modern-day environmental campaign in the United States started in the 1960s and 1970s. This campaign was basically centered on a few noticeable environmental concerns and failures. Environmentalism emerged to enhance a multifaceted campaign in the United States. In the mid to late 19th century, tangible resources were massively employed, particularly in the West. Land theorists and developers exerted over large stretches of woodlands and grazing land. Property significant to waterpower was enclosed by private interests. Mining companies followed inappropriate and destructive mining applications.

the answer is c.richard m. nixon

the following best describes postwar era writers in their works:

many writers,authors,novelists,poets concentrated more on social art and social writing and stayed away from political writings.