Which was a major source of debate between william mckinley and william jennings bryan in the election of 1896?

I believe the answer is: economic issues like bi-metalism, the Gold Standard, and Free Silver

These debate revolved around the main method of economic transactions. At that time, paper money was already exist, but its usage still hasn't been as popular as it is today. The debate revolved around the type of metals that should be used as acceptable medium of exchange.

the social historical theory explains the creation of the varnas, jats and of the untouchables. according to this theory, the caste system began with the arrival of the aryans in india. the aryans arrived in india around 1500 bc. the fair skinned aryans arrived in india from south europe and north asia.

"the attempts of the proletariat to rise above this abasement"