“which is people don't vote” vs “which is people not voting”

Question

1. We have a big issue in my country which is people don't vote for elections.

The first sentence, the part that is before which, is okay for me cuz it contains one verb. The second sentence contains two verbs. Is it correct or should I add -ing like:

2. We have a big issue in my country which is people not voting for elections.

Which one sounds more native and Colloquial according to AmE?

Answer 1

I would say 2. is more colloquial of the two.

To make the sentence work you need something else. Maybe something like so.

We have a big issue in my country which is that too few people vote in elections.