Douglas uses fallacious reasoning or logical fallacies in "What to the Slave Is the Fourth of July".
A rhetorician would often use logic and a well formed argument to tell the reader that their point is right or they can present an impassioned argument that may imply a sort of logical fallacy here but will get the point across with more emotion and more weight.
It is the second tactic that Douglass uses in "What to the Slave Is the Fourth of July".
It was more important for him to get his point across. So when he compares the blacks to the people of Moses in the Egypt he is not making a logical but an emotional comparison tween the plight of the two.
