The two details in the text that connect to the subject of Americans working hard at difficult jobs are:
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Bethany McLaughlin’s ancestors laying streetcar tracks - This detail highlights the physical labor and effort involved in infrastructure development, which is a hard job.
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Ty Smith’s ancestors growing cotton from sun-up to sun-down - This detail emphasizes the grueling work associated with agriculture, which is another example of hard labor.
These two responses clearly illustrate the theme of Americans working hard at demanding jobs.