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flag rule
(files.catbox.moe)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
Apparently, since 1959, the arrangement must entail "nine rows of stars staggered horizontally and eleven rows of stars staggered vertically."
https://www.si.edu/spotlight/flag-day/flag-facts#:~:text=Executive%20Order%20of%20President%20Eisenhower%20dated%20August%2021%2C%201959%2C%20provided,rows%20of%20stars%20staggered%20vertically.
Those are just executive orders, the flag code itself (which is a law) is a little vague.
Because getting congress to change a law after a new state is added gets a little annoying.
how often are you adding new states?
alaska and hawaii were added in 1959. From 1787 to 1959, a new state was added to the union every 3.44 years. So it used to happen pretty often, actually.