A wee bit of cause and effect:
I may never have lived in Alaska
if I didn't first go there on vacation.
I may have never gone to Alaska on vacation
if Colorado wasn't on fire in 2002.
I may not have thought to go to Alaska in 2002
if I hadn't discovered Northern Exposure ~1996.
I may never have discovered Northern Exposure
if I didn't quit a job I didn't like in 1995.
I may never have discovered Northern Exposure if a tv channel
that doesn't exist today hadn't aired it back then.
This keeps going back in time until I was born (or before then),
but that's the basic idea.