What if a mysterious Hacker just Uploaded a video saying "hello America what a good day to be alive right? what about a little nuclear detonation to even make it better!" and after 5 days of this ve

If this happened, national governments, intelligence agencies, and law enforcement organizations would immediately launch a massive investigation to identify and apprehend the hacker. The global community would be in shock and disbelief. Many countries would probably increase their security measures and invest in better surveillance technologies to prevent similar attacks in the future. International cooperation would be essential in order to track the hacker down and bring them to justice. If a specific country or group is found to be responsible, they could face severe economic sanctions or even military intervention from other countries. Ultimately, all nations would be determined to ensure that such an attack never takes place again.