What does shames mean when he says, “open space generated not just ambition, but metaphor” (para 12)?

This is a line in Laurence Shames’ “The More Factor.” In this essay, Shames argues that Americans have always valued the idea of having “more”. He states that this was intrinsic to the development of the nation during the years of the Wild West. People wanted more land, more riches, and were prepared to sacrifice everything in order to obtain it. He also argues that this desire for “more” has meant that Americans have forgotten about other values, concentrating on quantity instead of quality.

Shames also argues that the idea of “open space,” of unlimited land that could be grabbed, generated ambition, but it also generated a metaphor. That is, a metaphor of unlimited potential and growth. This metaphor is still associated with the idea of “conquering frontiers.” However, he argues that as hopes of growth are now put on the economy, we have to realize that growth is finite, and that we need to reexamine our values and future goals for the country.

i think its d, but grammarly says none

explanation:

the opening scene of "sweat" exposes the great emotional charge of the story. it shows the violence and abuse that dyes the marriage between delia jones and skyes.

skyes decides to terrorize his wife by pulling a bull whip (which resembles a snake), knowing that she is terrified of those animals. skyes laughs cruelly at her and kicks the laundry with which delia has been working hard, telling her to get rid of it. skyes also comments on her religious manners, telling his wife how ridiculous they are. delia reacts by threatening skyes with her frying pan, generating even more conflict