to cause - to generate - to produce

[dilodi83]

- The crisis sparked off a bitter civil war.
- The new airport brought about lots of changes on that island.

Which is the most suitable verb (among "to cause - to produce - to generate") which can be substituted to the two in bold? Might they all be correct?

[billmcd]

- The crisis sparked off a bitter civil war. "Caused" OK but I wouldn't use "produced" or "generated" in this context.

- The new airport brought about lots of changes on that island. When I hear "caused", I expect to hear something more specific rather than something general as with "changes", but "produced" and "generated" work for me.

Which is the most suitable verb (among "to cause - to produce - to generate") which can be substituted to the two in bold? Might they all be correct?

I wouldn't classify any of your alternative terms as incorrect. Rather, I have stated my preferences.