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US government agencies must now discontinue all but “essential” activities, such as law enforcement, potentially disrupting everything from air travel to the monthly unemployment report.
The impending shutdown will be different from past government closures, as President Donald Trump had warned Democrats that his administration would take “irreversible” actions if they allow government funding to lapse, including mass firings of federal workers.
What happens during the shutdown?
The Small Business Administration announced it would halt loan issuance, while the Environmental Protection Agency said it would suspend certain pollution cleanup efforts.
Why is this happening?
Shutdowns became less common in recent decades, but an increasingly divided political environment has left Congress unable to agree on spending.

The last federal shutdown, which lasted 35 days from December 2018 to January 2019, was the longest closure in US history. Source: Getty / Chip Somodevilla
Health care is the sticking point this time. Democrats say any spending bill must also make Affordable Care Act subsidies permanent, which are due to expire at the end of the year.
“The far left’s determination to oppose everything President Trump has said or done is not a good reason to subject the American people to the pain of a government shutdown,” Senate Republican leader John Thune said.
Democrats said they believed they were making headway with Trump after a meeting at the White House earlier this week. But hours later, Trump posted an AI-generated deep-fake video showing manipulated images of Democratic leaders that drew on stereotyped images of Mexicans.
What happened last time the government shut down?
There have been six shutdowns since 1990.