The Grange movement among farmers in the late 1800s focused on which of the following?

While urbanization has certainly influenced American culture, it is not the core focus of the Turner thesis. Turner specifically highlights the impact of the western frontier rather than urban areas, suggesting that the experiences and opportunities presented by the frontier play a more critical role in defining American identity.

This option touches on themes of social Darwinism, but it does not capture the essence of the Turner thesis. Turner's argument is centered on the frontier's role in promoting democracy and social development rather than merely focusing on competition or survival of the fittest as drivers of social progress.

This choice presents a critical view of American expansionism, which contrasts with the Turner thesis. Turner did not argue that territorial acquisition undermined ideals; instead, he posited that the process of westward expansion was integral to the development of American democratic principles.

This statement relates to the concept of American imperialism and maritime strategy but does not align with the Turner thesis. Turner’s focus was on the internal development of the nation through the frontier experience, rather than external factors such as naval power and market access.