In fact, it is the same party, but different people.

I was responding to the idea that minorities were using history to choose their roommates, and how if that were the case, it would not be so clear cut.

It is clear cut though. What we call the Democratic party today used to be called the Republican party. It has zero connection to today's Republicans.

That is certainly not true in many regards. See for example my sibling comment on progressivism and eugenics.

The Progressive party had followers in its own right, as well as those in both the Democratic and Republican party, at least until Theodore Roosevelt left the Republican party in 1912.

Among the progressive movements goals were getting women the right to vote, and disenfranchising black voters. The philosophies of eugenics, and obsession with purity, were in fact an inspiration for those people who would eventually attempt to purify Germany during the Nazi reign.

Although much has changed in the progressive movement in the years since, the application of eugenics through abortion to eliminate undesirables has not (from my other comment, see Iceland).