I initially wondered why the [[spoiler: antagonistic]] aliens decided to attack Earth on 4th of July since it seemed to be a rather big coincidence in the second movie. The answer is actually pretty simple. They wanted to demoralize the human inhabitants by basically [[CurbStompBattle: curbstomping]] their defenses on the very same day they celebrate their victory over the first invasion. Plus, security would probably be a bit more lax on that time of celebration which is a good bonus.
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