Because an American person went to the moon, and wanted to show his succes to everyone
The US flag is on the moon because the US landed there and planted it there to claim and prove we were there.
Neil Armstrong planted the U.S Flag on the moon.
us
Yes it is.
Yes a US flag was left in Tranquility bay by the Apollo astronauts.
1948
Omg the moon
1969
The moon
Yes :)
the moon.
teehee ^-^