Still, the slickly produced two-day National Front event at Lyon’s modernist conference center, full of party functionaries in blazers scurrying about, showed how far the party has come from its disreputable ragtag origins in the early 1970s, when it emerged as a xenophobic coalition of former Nazi collaborators and disgruntled veterans of the Algerian war who had not forgiven the country’s leaders for having agreed to Algeria’s independence — like Ms. Le Pen’s father, the party’s founder, Jean-Marie Le Pen.

She has effectively kicked him out of the party. But Ms. Le Pen’s populist tirade echoed with many of the former patriarch’s themes. She delivered her speech against a screen projecting the words “In the Name of the People,” and it was full of immigrants committing crimes, jihadists plotting attacks and European Union bureaucrats stealing jobs from the French.

Ms. Le Pen promised to crack down on all of them. Clearly buoyed by Mr. Trump’s victory after years of electoral defeats in France — “The impossible becomes the possible,” Ms. Le Pen said of it — she offered a sketch of what her presidency might look like. She promised to hold a referendum within six months on European Union membership, which she called a “nightmare,” secure the country’s borders and pull France out of NATO. Foreigners, she said, were eating up France’s social benefits and offering little in return. “Our benefits are distributed to people all over the world,” she said.

But in contrast to Mr. Trump, for Ms. Le Pen restoring what she called “sovereignty” to France appeared as an end in itself. She offered no return to a golden age of prosperity for her country, promising instead to “restore order” within five years. Ruin was just around the corner, in her telling. “After decades of cowardice and laissez-faire, our choice is a choice of civilization,” she said. “Will our children live in a country that is still French and democratic?”

The crowd ate it up. “She’s got a real program, in the name of the people, for the workers, and by the workers,” said Eric Fusis, a 58-year-old retired military officer from the Doubs. “It’s for the nation, and not for the financial sector and the banks,” he said.