Answer :
A flag be flown at half-staff after the president of the united states dies is for 30 days.
What is the meaning to flown a flag at half-staff?
Flags flying on half poles were brought half-down as an expression of mourning for someone's death. All flags at Buckingham Palace were flown at half-staff. The flag shall not be hoisted at half-staff on a wall-mounted pole more than 45 degrees from the vertical. A suitable alternative is to add a mourning tie, a black ribbon attached to the top of the flag. It means that you shouldn't. The monarchy is continuous, one sovereign is quickly replaced by the next, so there is no mourning of the monarch's role. However, other flags, such as the Union flag, are lowered to half-mast to honor the deceased.
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