According to Douglass, what is the hypocrisy of the internal slave trade?from Narrative of the Life of Frederick Douglass book

Douglass does not talk about this in his autobiography. 
Instead, he talks about it in the speech he gave in Rochester, New York on the Fourth of
July 1852.

In this speech, he says that the American view
of the internal slave trade is hypocritical because Americans think that it is in some
way different than the external slave trade.

He points out
that people say bringing new slaves from Africa is horrible and that the US spends a lot
of money preventing this trade.  But, he says, there's no difference between that and
selling slaves within the US.

So he says it's hypocritcal
to criticize one kind of slave trade and condone another.