WASHINGTON — A relatively trouble-free presidential election was good news for those working to restore faith in the system. Less encouraging was a flood of misinformation that sought to undermine trust in voting and sow chaos, something experts say is likely to get worse in the years ahead.

The most significant test for officials on Election Day was a series of bomb threats reported in five battleground states, some of which forced polling places to be evacuated temporarily. The day otherwise played out like most other election days, with only routine problems, and former President Donald Trump’s commanding lead allowed the presidential race to be called early Wednesday morning.

“High turnout and wide margins — that’s all we ever hope for,” said Zach Manifold, the elections supervisor in Gwinnett County, Georgia.

The more than 84 million people who voted early, either in person or by mail, eased the crush Tuesday and provided election workers with more flexibility to respond to unexpected problems.

The FBI said the threats appeared to originate from Russian email domains, though federal cybersecurity officials cautioned the culprits were not necessarily Russian.

Interference from Russia and other foreign adversaries was a constant theme running through election season.

Russia, Iran and China steadily increased their use of English-language disinformation in the months leading up to Election Day. Their motives varied, but their tactics were similar: Using networks of bogus social media accounts and websites to spread content designed to erode confidence in election security and American democracy.

Russia was particularly audacious, creating and spreading staged videos that aimed to smear Vice President Kamala Harris and her running mate, Minnesota Gov. Tim Walz. The Kremlin’s efforts this year also involved paying a Tennessee media company $10 million to produce pro-Russian content.

“Russia clearly interfered in this election,” said Brian Taylor, a political science professor and Russia expert at Syracuse University. He said Russia’s objectives were to “help Trump and to sow chaos more generally — although there is no evidence that their activities changed the outcome.”

Experts say America’s adversaries are playing a long game, using disinformation to undermine Americans’ confidence in their own country and gradually diminish U.S. power. Russia, in particular, preferred Trump as a candidate because he is seen as less likely to support assistance for Ukraine, said Emerson Brooking, resident senior fellow at the Atlantic Council’s Digital Forensic Research Lab, which tracks foreign disinformation.

“None of this goes away after Election Day,” Brooking said. “What are Russia’s goals? It wasn’t to elect President Trump, but to steer the United States in a particular direction. Trump’s election is one step in that process.”

Russia, Iran and China have rejected allegations they sought to meddle with the U.S. election.