the confederados still have southern sentiment and made their own communities in brazil. despite slavery was still legal in brazil till 1886, did they attempt to prolong it, did they influence their republican form if governent, did jim crow exist there? what did confeds think of race and economic class as well as blanquemiento?
the fact that most Brazilians did not know of them is a pretty indication that they did not interfere.
also, they were called by the Brazilian Emperor Dom Pedro II, in an attempt to grow cotton, as they were mostly southerners. Voting law in Brazil was a bit fair(10-20% of the people could vote, something rare at the time I suppose), but was probably still not enough to make cotton farmers, and even immigrants to vote.