Small subsistence farmers (non slaveholding)
I'm not sure if you made a typo or not but in the current context I can only see negligible being relevant.
their disagreement was over who the successor was
By insuring bank deposits up to $5,000.
The FDIC was a part of the New Deal programs of legislation during the presidency of Franklin Delano Roosevelt (FDR). FDR signed the measure into law in June, 1933. The program went into effect as of January 1, 1934. Banks soon learned they needed to enroll in FDIC or customers wouldn't come to their banks.
After the civil war, railroads connected the country on a national scale, boosting the economy and leading to mass production, mass consumption, and encouraging entrepreneurs.