How and when was the american vulnerabilities visible

Well, The shift from craft production in small shops and mills to large‐scale industrial production in factories

was a major factor setting the context of poverty and vulnerability at the start of the 20th century.  

Industrialization progressed rapidly in the United States in the decades after the Civil War.  During the

period running from the 1870s to 1900 that Mark Twain and Charles Dudley Warner christened the

Gilded Age, progress in science began to interact with technological development, accelerating the pace

of industrialization still further and making great fortunes for the founders and leaders of large industrial. Hope That Helps!

From Itsbrazts.