Shutdowns are a repeat element of US politics – but the current situation appears particularly intractable due to shifting political forces and bad blood between both major parties.
Some government services face a temporary halt, with approximately 750,000 people likely to be placed on unpaid leave as both political parties can't agree on a spending bill.
Legislative attempts to resolve the deadlock continue to fall short, and it is hard to see a clear resolution path this time because each side – including the President – perceive advantages in digging in.
These are the four ways that make this shutdown distinct currently.
Democratic supporters have insisted for months for their representatives adopt stronger opposition against the Trump administration. Currently the party leadership has a chance to show they have listened.
In March, the Senate's top Democrat faced strong criticism after supporting a Republican spending bill and averting a government closure in the spring. Now he's holding firm.
This presents an opportunity for the Democratic party to show they can take back some control from a presidency that has moved aggressively on its agenda.
Opposing the GOP budget proposal carries electoral dangers that the wider public will grow frustrated as the dispute drags on and impacts accumulate.
The Democrats are leveraging the shutdown fight to highlight concerns about expiring health insurance subsidies together with GOP-backed federal health program reductions for the poor, which are both unpopular.
Additionally, they're attempting to curtail the President's use of his executive powers to cancel or delay funding authorized legislatively, which he has done in international assistance and various federal programs.
The administration leader and one of his key officials have made little secret of the fact that they perceive an opening to advance further the cutbacks to the federal workforce implemented during the current presidential term to date.
The President himself said last week that the government closure provided him with a "unique chance", adding he intended to cut "opposition-supported departments".
Administration officials said it would be left with the "unenviable task" involving significant workforce reductions to keep essential government services operating if the shutdown continued. An administration spokesperson described this as "fiscal sanity".
The scope of the potential lay-offs is still uncertain, but the White House have been consulting with the Office of Management and Budget, the budgeting office, under the leadership of the administration's budget director.
The administration's financial chief has previously declared the suspension of federal funding for regions governed by the opposition party, including New York City and Illinois' largest city.
While previous shutdowns have been characterised by extended negotiations between the two parties in an effort to get federal operations, currently there seems minimal cooperative willingness for compromise presently.
Conversely, animosity prevails. Political tensions persisted recently, as both sides blaming each other regarding the deadlock's origin.
House Speaker a Republican, accused Democrats with insufficient commitment about negotiating, and maintaining positions during discussions "for electoral protection".
Meanwhile, the opposition's chief made similar charges at the other side, saying that a majority party commitment to discuss healthcare subsidies after operations resume cannot be trusted.
The administration leader personally has inflamed the situation through sharing a controversial AI-generated image of the Senate leader and the top Democrat in the House, where the representative appears wearing a large Mexican-style sombrero and facial hair.
The affected legislator and other Democrats called this racist, a characterization rejected by the administration's second-in-command.
Experts project about 40% of government employees – more than 800,000 people – to be put on unpaid leave as a result of the government closure.
That will depress spending – and also have wider ramifications, including halted environmental approvals, delayed intellectual property processing, interrupted vendor payments along with various forms of government activity connected to commercial interests comes to a halt.
The closure additionally introduces new uncertainty into an economy already being roiled from multiple factors including trade measures, earlier cuts to government spending, immigration raids and technological advancements.
Analysts estimate potential reduction of approximately 0.2% off US economic growth weekly during the closure.
However, economic activity generally rebounds the majority of interrupted operations after a shutdown ends, as it would after disruption after major environmental events.
This might explain partially why financial markets have shown limited reaction by the current stand-off.
Conversely, experts indicate that if administration officials implement proposed significant workforce reductions, the damage could be extended in duration.
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