Here is a Cultural Literacy Worksheet on the proverb For Want of a Nail the Kingdom Was Lost. It’s a half-page document with a short reading and three questions.
Because this is a classic proverb that originates in a Middle High German form as early as the 13th century, and has been a constant across the centuries. In its entirety, which is only seven lines, it’s a nice little chain of cause and effect. I think there is a lesson in all this about the consequences of omission and neglect.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.