The government can operate as a reserve until June, when the closure may occur, but the issue of the debt ceiling is purely political and will not greatly affect the economy, given the government's ability to borrow without retroactive effect.
I created this thread about the debt ceiling, you can read it here ---->
https://bitcointalk.org/index.php?topic=5432143.msg61509448#msg61509448Therefore, there is no great economic dependence on this issue, and I do not think that politicians will be that stupid to make America default.