TAIPEI, Republic of China — Ruling-party candidate Lai Ching-te emerged victorious in Taiwan’s presidential election on Saturday and his opponents conceded, a result that will chart the trajectory of the self-ruled democracy’s relations with the People’s Republic of China over the next four years.

At stake is the peace and stability of the island democracy, 100 miles off the coast of mainland China, that Beijing claims as its own and to be retaken by force if necessary. Domestic issues such as the sluggish economy and expensive housing also featured prominently in the campaign.

Communist China had called the poll a choice between war and peace. Beijing strongly opposes Mr. Lai, the current vice president and a member of the governing Democratic Progressive Party, or DPP.

Mr. Lai and incumbent President Tsai Ing-wen reject the People’s Republic of China’s claims to sovereignty over Taiwan, a former Japanese colony that split from the mainland amid civil war in 1949. They have, however, offered to speak with Beijing, which has repeatedly refused to hold talks and called them separatists.

Beijing was believed to favor the candidate from the more China-friendly Nationalist party, also known as Kuomintang. Its candidate, Hou Yu-ih, also promised to restart talks with China while bolstering national defense. He promised not to move toward unifying the two sides of the Taiwan Strait if elected.

A third candidate in the race, Ko Wen-je of the smaller Taiwan People’s Party, had drawn the support particularly of young people wanting an alternative to the Nationalists and the ruling Democratic People’s Party, Taiwan’s traditional opposing parties, which have largely taken turns governing since the 1990s. Mr. Ko also stated he wanted to speak with Beijing, and that his bottom line would be that Taiwan needs to remain democratic and free.

America, which is bound by its laws to provide Taiwan with the weapons needed to defend itself, pledged support for whichever government emerges. The pledge is reinforced by the Biden administration’s plans to send an unofficial delegation made up of former senior officials to the island shortly after the election.

Beside the China tensions, domestic issues such as the dearth of affordable housing and stagnating wages have dominated the campaign. For a 74-year-old retiree, Tony Chen, who voted in Taipei in the hour before the polls closed, the election boiled down to a choice between communism and democracy.

“I hope democracy wins,” he said. He added that more Taiwanese were open to China’s model of governance decades ago, when the Chinese economy was growing by double digits annually, but are repulsed by the crackdown on civil liberties that has occurred under President Xi, the party boss on the mainland.

Stacy Chen, 43, said she has always voted for DPP because “Taiwan is an independent country.” She said she wanted her son to grow up in a country that is separate from China.

For Ben Wang, 44, the vote was more about altering the dynamic between Taiwan’s main opposing parties, the DPP and the KMT. A potential attack by Communist China could not be pre-empted by anything Taiwan would do, he said.

Taiwan’s election is seen as having “real and lasting influence on the geopolitical landscape,” said the associate director with the global intelligence consultancy S-RM, Gabrielle Reid.

“The outcome of the vote will ultimately determine the nature of ties with China relative to the West and will have strong bearing on the state of play in the South China Sea,” she said.

Beside the tensions with the People’s Republic, domestic issues dominated the campaign, particularly an economy that was estimated to have grown just 1.4 percent last year.

That partly reflects inevitable cycles in demand for computer chips and other exports from the high-tech, heavily trade-dependent manufacturing base, and a slowing of the Chinese economy.

Longer-term challenges, though, such as unaffordable housing and wage stagnation topped voters’ concerns.