Like I said the irony of the show didn't really sink in until the last episode. The location, Boston and the name the survivors take 'The 2nd Massachusetts' are all chosen to evoke folk memories of the American Revolution and just in case nobody noticed the historian/militia leader who serves as the series hero explicit references the revolution when they face off against an alien attack. I didn't record the programme so I can't give you the details of the speech but I remember something about militias striking a blow for freedom against a more powerful foe.
The thing is the though; if you're looking for an analogy - a brave people facing a doomed battle against a technologically superior enemy who seems intent on wiping them out and stealing all their land- it isn't the American War of Independence. Right continent wrong protagonists.
The makers of this series have to be aware of that - don't they? They can't really be that historically unaware - can they?