Hundreds of thousands of federal workers will be unable to report for work on Monday, as the US Senate struggles to end a government shutdown.
Some will not be paid until the stalemate is resolved.
A rare Sunday session of the Senate yielded no agreement between Democrats and Republicans, with immigration one of the main sticking points.
Essential services will still run but famous sites such as the Statue of Liberty have already been affected.
The monument was closed on Sunday but New York Governor Andrew Cuomo said he would dip into state funds to pay the daily employment bill and reopen the popular tourist site.
Why has the government shut down?
It missed a deadline. At midnight on Friday, lawmakers failed to agree on a spending bill. The bill was not a plan for funding for the whole of 2018, but would have kept things running until the middle of next month.
Democrats refused to back a temporary deal until their concerns on immigration reform were dealt with.
Efforts to reach a compromise ahead of the working week failed late on Sunday.
A vote to end the shutdown was postponed until midday (17:00 GMT) on Monday, meaning many federal government offices will not open.