There is probably a fair amount of truth in that, but I think it's only part of the story. The Democrat party from 1968 through 1992 was losing big in national elections, and Carter only managed to win in 1976 because of Watergate.
The Dims has lost their electoral viability among the extant population demographics of those years, and have only become competitive in presidential races again because of the massive influx of poor and poorly educated immigrants from third world nations, both legal and illegal entrants.
The Dims success is and will continue to be dependent upon that large influx of poor immigrants. They know it and have been acting upon it. The GOP has been acting like clueless and self-destructive nitwits on the issue, while helping to restore the Dims electoral viability.
So this influx is due to both globalist influences and also just plain old American politics as the Dim party has used it to keep themselves viable.
<....”this influx is due to both globalist influences and also just plain old American politics as the Dim party has used it to keep themselves viable”...>
Agree.... and of course now the Hispanics, Asians and Middle Easterners have been added to the black population as the Dims cannon fodder to win elections from here on in....... Though the blacks are slowly recognizing they are being outnumbered and pushed to back of the bus again by the Dims.... the Dims will not be placating them as much as they have in the past two elections. They will give them just enough to keep them from rebelling.