I filmen har utlänningar förstört de flesta världsstäder och mänsklighetens bästa vapen är viljan att överleva. Jag tror att människans överlevnad i den här filmen heter "självständighet"
Här är vad Wiki har att säga om din fråga motiverad för att fira den 4 juli som en världsomspännande "självständighetsdag":
With the successful implantation of the virus, Whitmore leads the attack against an alien destroyer approaching Area 51. Although the force field is deactivated and the fighters are able to inflict damage, the hull of the destroyer is too big to inflict serious damage. As a result, the fighter's supply of missiles quickly becomes exhausted. As the destroyer prepares to fire on the base, Casse has one missile left, but it jams. He decides to fly his plane directly into the alien weapon in a kamikaze attack, which kills him but destroys it. The Americans inform resistance forces around the world about how to destroy the alien ships. The nuclear device destroys the alien mothership as Hiller and Levinson escape unharmed back to Earth. The whole world then celebrates its heroes' victory as well as its true 'Independence Day'.