What two unprecedented events occurred in connection with the era voting?

The two unprecedented events that occurred in connection with the ERA voting was 1. when the ERA failed to get approved within its seven-year limit, in which the Congress had to extend the approval time with three more years and, 2. five states tried to take back their votes after the bill was not approved even with its extension.

The first one is russia because in russia they were on the rough times and they never had a way to get out of