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Adlai Stevenson ran for president, lost twice, and the Democratic Party’s profile hardly changed between 1952 and 1960. Richard Nixon ran for president three times, won twice and lost once, and there was barely any difference between the Republican Party that gave him the nomination in 1960 and the one that renominated him in 1972.

Major American political parties are stable institutions. Warren G. Harding can come and go, and he’s succeeded by Calvin Coolidge and then Herbert Hoover and you would need an electron microscope to discern the difference between the party in the 1920 election cycle and the 1932 cycle.

This is why Donald Trump — “an agent for change,” former New York Mayor Rudolph Giuliani said from the convention podium this week — is such a remarkable, formidable and possibly transformative Republican presidential nominee. He has the potential to change everything — the presidency, the way aspiring nominees campaign for the job and, pointedly, the Republican Party itself, which this year is celebrating its 160th birthday.

But there is great discomfort in the air, too, along with the movement. The GOP is undergoing change — profound, significant change that has within it the possibility of altering American politics for a decade if not a generation.

There are three scenarios, each in its own way terrifying to the thousands of party leaders who have gathered and to the many more at home, at least some because they find Mr. Trump’s nomination offensive and dangerous.

One of those scenarios is that Mr. Trump prevails and the whole architecture that has sustained the Republican Party since the Nixon years collapses. Another is that he is defeated and the party reverts to a Republican restoration, with the 2020 nominee looking like the lost little brother or sister of Mitt Romney. A third is that his defeat leads to a GOP kulturkampf where tea party hardliners, strengthened because they are re-elected in safe House districts, have a larger proportional role in a vastly diminished Republican coalition.

If Mr. Trump does prevail, he may play the role of Franklin Roosevelt in 1932 and Ronald Reagan in 1980: transforming the demographic profile of their respective parties. Both appealed to blue-collar workers, with FDR bringing the working families of European immigrants into the Democratic Party and Mr. Reagan attracting many of the older brothers and sisters of the Trump coalition. The difference in 2016 is that these new Republicans possess anger and alienation of a sharply different character than the rump of the party they are joining.

The perils were on full display earlier this week when House Speaker Paul Ryan of Wisconsin met with a group of reporters and sought to stress party unity and to look aside from a party nominee whose views and manner are at odds with him. “I think (Mr. Trump) has changed the party but I don’t think any one person possesses this party,” Mr. Ryan said. “I really don’t see it that way. I think this party is going through creative change. I think he’s brought a lot to this party. I think he’s brought a lot of new people to this party.”

That’s why Gov. Mike Pence of Indiana, Mr. Trump’s running-mate, was such a balm to the party. The Trump partisans like him because their candidate covered him with stardust, the regulars because he has the conventional experience of time in the House and in a governor’s chair, and the conservatives like him because he is one of them. In his time as head of the conservative Republican Study Committee he referred to himself as “Rush Limbaugh on decaf.” The conservatives liked the first two words, the regulars the last two.

The Pence selection is far more important for the internal politics of the Republican Party than for its external effect. Only one vice-presidential selection since 1988, Sen. Albert Gore of Tennessee, prompted as much as a third of the public to say it was more likely to support a party ticket. Only 14 percent of those surveyed said they were more likely to support a ticket that included Joseph R. Biden Jr. (2008) or Richard Cheney (2000).

But there is no denying that Mr. Trump carried 36 states and won 13.4 million votes, but it is worth pointing out he took a smaller percentage of primary and caucus votes than Mr. Romney in 2012 or Sen. John McCain of Arizona in 2008. But for all Mr. Romney’s business orientation and Mr. McCain’s maverick streak, neither possessed the potential, ability or inclination to change the Republican Party.

Mr. Trump, who speaks of making America great and has the potential of remaking the GOP, possesses all three, and he takes that into a race essential for the Republican Party, shut out of the White House for eight years. Back in October, Republican chairman Reince Priebus, worried that the GOP does well in midterm elections but is endangered in presidential elections, said, “We’re cooked as a party for quite a while if we don’t win in 2016.”

Mr. Trump is one of those rare presidential nominees who has the potential of winning the White House — and also of being defeated decisively. A defeat would warn the Republicans away from a candidate like Mr. Trump again. But, the new nominee says, “We didn’t come this far to lose,” and a victory would remold the party in Mr. Trump’s image — and the long-term effect of that cannot be predicted.

David Shribman is executive editor of the Pittsburgh Post-Gazette.

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