Go-Go and the Little One made a fort on the couch, using the couch cushions, and Go-Go told me a story.

A long time ago the bad guys attacked so the American soldier was invented.

Invented? Where did she hear this word and how did she associate it with the creation of people?

Only they were all killed. The bad guys knocked down the wall and all the good guys fell out of the fort. They were still alive, but were eaten by coyotes. Only one survived, and he was the commanding officer.
The End

A little macabre? And Little sister just loves playing along, rolling off the cushions and then playing dead.