US Immigration from Latvia

Are there any movies that are historically accurate enough that could be watched that can help with the history part? Of course it is a fiction and somebody's vision, but some are more truthful than others. Family movie night could become educational. Specifically about the writing of the declaration of independence and events surrounding mid 18th century.

Just wondering if any of you have ever been asked to show your GK?

Last time was probably many years ago, when I applied for account at my local credit union bank.

I am self - employed, so my employer does not need it. I renewed my drivers license, they never asked for it.

I really can not think of the last time I had to show my GK, aside from airport?

Even at a car accident several years ago, a guy bumped me from behind, police officer never cared to see it.

Maybe my life really is very uneventful, lol.

I mean I have been here 13 years, so everything is already established, but still. I am trying to think of scenarios where I would actually need to show my GK.

I just submitted N-400 online. My Green Card Expires in 3 Months. Should I worry? What should I do?