In what ways did populist and progressives differ?

Progressive movement defends that be the capacities of an individual and not the social and economical conditions that determine the limit of his aspirations. 

 Populist movement/parties/leaders is one which uses various resources to obtain popular support.

The correct answer to this open question is the following.

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The aspects of African American behavior in the British North American colonies during the late 1700s that could be referred to as "Petition of Slaves" can be traced to the petition for freedom expressed by a black slave whose name was Felix in 1773, in Boston, Massachusetts.

The petition was submitted to the government of Massachusetts, In that time, Thomas Hutchinson was the governor.

The historic importance of this petition was that it represented the first time that a black slave wrote a petition to get his liberty and it was submitted to a government instance. In this case the legislature of Massachusetts. After this letter, many more followed.