The US continually increases the debit ceiling whenever it is reached. It has been raised over 30 times in the last 30 years. The debt ceiling as explained by the Government Accountability Office is:
The debt limit does not control or limit the ability of the federal government to run deficits or incur obligations. Rather, it is a limit on the ability to pay obligations already incurred.
Since th US deficit is the difference between expenditures and revenue, and the debi ceiling limits the ability of the US to pay obligations, if the debt ceiling isn't raised, ...
Would it force the federal government to spend no more money than it takes in?