The Democrats cannot gain an overall majority for very long without running into the problem of there not being enough political largess to go around. There are only so many seats in Congress, or the Senate, and one President. He only makes about 900 appointments that require Senatorial vetting ~ and the state legislatures are also limited in political opportunity.
As the Democrats grow they end up short changing more and more of their followers ~ and eventually those folks look around for better opportunities elsewhere. That's where THE OTHER PARTY starts looking good!
You might ask when this ever happened and you'd be right to do so. First, Jefferson discovered the phenomenon that you needed to get 50%+1 vote to win an election, and if you could do that you were unstoppable. His new Democratic-Republican party put the Federalists out of business in the first contested election!
Within a few years several minor parties popped up but didn't get a major following because they didn't have popular policies. Finally the Whig party latched onto PUBLIC WORKS and the FEDERAL BUDGET! BINGO!!!!!! That was a major public policy coup. They began winning elections.
The Whigs attempted to hold on to their Southern wing by stepping aside from the slavery issue, and that was their downfall. They collapsed as a national party and a new party made up of Abolitionists and Whigs arose ~ we call it the Republican party.
Over the years since each party has gained and lost large factions, yet no matter how dominant either one has been anywhere in the country for however long, the end result is fairly evenly divided government.
Mathematicians ascribe the permanent split to the single member district ~ just as Jefferson observed 200 years ago.
Democrats might imagine, as you do, that they can create a permanent majority, but it doesn't work that way! Never did.
Thank you for your post. It gives me some hope in the future.
So we just have to accept an immigration-driven transformation into a third world country, and then try to take advantage of the opportunities presented by the Democrats’ inability to effectively placate this new population?
That doesn’t sound like a pleasant future for the United States. But I disagree with your general premise. We haven’t been here before. The current situation is new. Because of how chain migration works, mass immigration of natural Democrats could continue for decades more. You may be right that a much less conservative Republican party can take advantage of this, but a conservative movement has little or no hope. Most Hispanics reject conservatism. Most Asians reject conservatism. Most African (assuming it’s the next source of mass immigration) would reject conservatism.
I’m sorry but I just don’t see anything good about the scenario you lay out, where Republicans have to compete to win over an ever-more left wing population.