Question

cross of gold: the cause of humanity
click to listen to the audio file of a studio recording of bryans speech, noting the excerpt.
what cause is bryan comparing to \the cause of liberty\ and \the cause of humanity\?
the humblest citizen in all the land, when clad in the armor of a righteous cause, is stronger than all the hosts of error. i come to speak to you in defense of a cause as holy as the cause of liberty—the cause of humanity. the individual is but an atom, he is born, he acts, he dies, but principles are eternal, and this has been a contest over a principle.
—cross of gold
free silver
populism
the gold standard

Explanation:

In his "Cross of Gold" speech, William Jennings Bryan was a strong advocate for the free - silver movement. He compared the cause of free silver to the cause of liberty and the cause of humanity, believing it was a just and important economic principle for the common people.

Answer:

free silver