The US government has had 20 funding gaps, resulting in 10 shutdowns since 1976, the longest lasting 35 days.
The United States federal government shut down at 12:01am East Coast time (04:01 GMT) on Wednesday after Congress failed to pass a new spending bill, forcing operations considered inessential to close.
President Donald Trump has threatened to use the budget deadlock to push through mass layoffs of federal employees.
Democrats and Republicans remain divided over spending priorities as Democrats push to protect healthcare, social programmes and foreign aid while Republicans demand cuts.
This is not the first time Washington has faced such a standoff.
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