Final answer:
The New South movement aimed to modernize the southern economy and society after the Civil War, emphasizing industrialization, expansion of agricultural practices, and the embrace of new technologies. However, strict segregation was not advocated by the boosters of the New South.
Step-by-step explanation:
The correct answer is D: Advocacy for strict segregation.
The New South movement in the United States aimed to modernize the southern economy and society after the Civil War. Its boosters emphasized industrialization, expansion of agricultural practices, and the embrace of new technologies as key areas of focus. However, they did not advocate for strict segregation, as this policy perpetuated racial inequality and hindered social progress. Instead, many New South promoters believed in creating a more diverse and prosperous society by attracting immigrants and encouraging industrial growth.