国土之上是一部纪录片片，一部关于9.11的纪录片,详细纪录了2001年9月11日当天上午几个小时内在美国国土之上发生的那次改变了世界的袭击.
A documentary about September 11, where the 9/11 Commission Report is used to study the attack and the systemic flaws that allowed it to happen.
