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I live in a country (Canada) where electoral boundaries are set by an independent, non-partisan commission, so I’m not an expert on gerrymandering my any means. However, I do believe that the logic of “affirmative gerrymandering” in Florida made some sense in the past. **Consider that there were no Black legislators from the state of Florida in Congress between 1873 and 1993, until Rep. Corrine Brown was elected in Florida’s 3rd district, which was heavily gerrymandered.** For the record, she is now the Representative for Florida’s 5th District, which is shown in OP’s map.
> The ability to gerrymander can create strange bedfellows interested in securing reelection; in some states, Republicans have cut deals with opposing black Democratic state legislators to create majority-black districts. By packing black Democratic voters into a single district, they can essentially ensure the election of a black Congressman or reelection of a black state legislator due to the packed concentration of Democratic voters—however, the surrounding districts are more safely Republican in areas like the South, where white conservatives have increasingly shifted from the Democratic to the Republican Party in national elections in the last four decades.
However, gerrymandering often has a perverse outcome today for two reasons: 1) the Black and Latino populations have increased relative to the White population, and 2) the White population is now more comfortable voting for a Black candidate. Thus the gerrymandered districts vote *overwhelmingly* Democrat, such that Congresswoman Brown ran unopposed in 2004, 2006 and 2008, and then won 70% of the vote in 2012 and 65% in 2014. If you were to redistribute those “extra” Democratic votes to another district, Ms. Brown would likely still win her seat (albeit in a more competitive race) and a Democrat could also win a neighbouring Republican district in an equally competitive race.
TLDR: Gerrymandering can help ensure legislative representation for a geographically dispersed minority group under a first-past-the-post system, but if can also be used to limit the political influence of that same minority group in neighbouring districts.