The classic chain is still there, anyone can use it if they like. That's probably the best thing that happened, both groups had their own way and went their own way. You can't satisfy everyone and keep them on the same chain.
Technically, no transactions were undone, but the fork agreed to a new state set in the future. The users of the new version also had a choice if they wanted to support the fork or not, the majority went with the fork. It's not like anyone was forced to fork. Actually, you could even run both, and I did for a time until it was clear who was the winner.
Technically, no transactions were undone, but the fork agreed to a new state set in the future. The users of the new version also had a choice if they wanted to support the fork or not, the majority went with the fork. It's not like anyone was forced to fork. Actually, you could even run both, and I did for a time until it was clear who was the winner.
This is a screenshot of the choice everyone was asked when starting up their wallet: https://upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Et...