America was built by materialistic and sometimes superficial strivers. It was built by pioneers who voluntarily subjected themselves to stone-age conditions on the frontier fired by dreams of riches. It was built by immigrants who crammed themselves into hellish tenements because they thought it would lead, for their children, to big houses, big cars and big lives.

America has always been defined by this ferocious commercial energy, this zealotry for self-transformation, which leads its citizens to vacation less, work longer, consume more and invent more.

Many Americans, and many foreign observers, are ambivalent about or offended by this driving material ambition. Read “The Great Gatsby.” Read D.H. Lawrence on Benjamin Franklin.

But today’s Republican Party unabashedly celebrates this ambition and definition of success. Speaker after speaker at the convention in Tampa, Fla., celebrated the striver, who started small, struggled hard, looked within and became wealthy. Speaker after speaker argued that this ideal of success is under assault by Democrats who look down on strivers, who undermine self-reliance with government dependency, who smother ambition under regulations.

Republicans promised to get government out of the way. Reduce the burden of debt. Offer Americans an open field and a fair chance to let their ambition run.

If you believe, as I do, that American institutions are hitting a creaky middle age, then you have a lot of time for this argument. If you believe that there has been a hardening of the national arteries caused by a labyrinthine tax code, an unsustainable Medicare program and a suicidal addiction to deficits, then you appreciate this streamlining agenda, even if you don’t buy into the whole Ayn Rand-influenced gospel of wealth.

On the one hand, you see the Republicans taking the initiative, offering rejuvenating reform. On the other hand, you see an exhausted Democratic Party, which says: We don’t have an agenda, but we really don’t like theirs. Given these options, the choice is pretty clear.

But there is a flaw in the vision the Republicans offered in Tampa. It is contained in its rampant hyperindividualism. Speaker after speaker celebrated the solitary and heroic individual. There was almost no talk of community and compassionate conservatism. There was certainly no conservatism as Edmund Burke understood it, in which individuals are embedded in webs of customs, traditions, habits and governing institutions.

Today’s Republicans strongly believe that individuals determine their own fates. In a Pew Research Center poll, for example, 57 percent of Republicans believe people are poor because they don’t work hard. Only 28 percent believe people are poor because of circumstances beyond their control. These Republicans believe that if only government gets out of the way, then people’s innate qualities will enable them to flourish.

But there’s a problem. I see what the G.O.P. is offering the engineering major from Purdue or the business major from Arizona State. The party is offering skilled people the freedom to run their race. I don’t see what the party is offering the waitress with two kids, or the warehouse worker whose wages have stagnated for a decade, or the factory worker whose skills are now obsolete.

The fact is our destinies are shaped by social forces much more than the current G.O.P. is willing to admit. The skills that enable people to flourish are not innate but constructed by circumstances.

Government does not always undermine initiative. Some government programs, like the G.I. Bill, inflame ambition. Others depress it. What matters is not whether a program is public or private but its effect on character. Today’s Republicans, who see every government program as a step on the road to serfdom, are often blind to that. They celebrate the race to success but don’t know how to give everyone access to that race.

The wisest speech departed from the prevailing story line. It was delivered by Condoleezza Rice. It echoed an older, less libertarian conservatism, which harkens back to Washington, Tocqueville and Lincoln. The powerful words in her speech were not “I” and “me” — the heroic individual. They were “we” and “us” — citizens who emerge out of and exist as participants in a great national project.

Rice celebrated material striving but also larger national goals — the long national struggle to extend benefits and mobilize all human potential. She subtly emphasized how our individual destinies are dependent upon the social fabric and upon public institutions like schools, just laws and our mission in the world. She put less emphasis on commerce and more on citizenship.

Today’s Republican Party may be able to perform useful tasks with its current hyperindividualistic mentality. But its commercial soul is too narrow. It won’t be a worthy governing party until it treads the course Lincoln trod: starting with individual ambition but ascending to a larger vision and creating a national environment that arouses ambition and nurtures success.