The US may be in debt, but that doesn't mean they're close to collapsing. They're being pushed towards collapsing because the US has served its purpose for those who own the politicians, banks, etc., and the US is losing a majority of the value it used to have.
It will likely continue for a long time, but it is definitely being tested. Hillary would have ensured that the US would have devolved into a less-productive country (note a lot of the survey after the election), but Trump presents a wildcard. We have yet to see what happens.
Though this very difficult in the near future is not impossible because there are the conditions that USD may collapse. The debt to GDP is over 100% that means repay of dept will be with cheaper money if US government decides a small devaluation. Secondly his strength is based on reserves of foreign currency banks. If the latter lose their credit to dollar then another fiat must replace it. Euro after the crisis in eurozone is weak with uncertain future. China, although holds a big part of US dept will not left behind for a long time if believes that RMB can replace dollar and maintain their current economic growth.
