Will it matter if you apply for an American visa because you have been detained for three days?

Anyone can be detained for seven days.

Public security detention is not a major case and will not affect the US visa.

Because the criminal record of the applicant cannot be found in the American system, as long as the proof materials provided by the applicant meet the requirements and do not meet the characteristics of immigrants, tourist visas will generally be granted.

However, if the applicant has a criminal record and meets the exit restrictions of the Entry-Exit Administration Law, even if he has a US visa, he cannot leave the country, which is why the US Visa Center does not review the applicant's criminal record.