It was on-off for centuries before the problem was solved for good (?). The most obvious lasting effect of it is their funerary customs. Other effects include the unification of the country (grossly simplified and there are other causes), and various other cultural quirks.
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In reality probably not but they likely feel like they're having a different time 😂

That's the fun part

It is very plot related.

He's a parrot with human level intelligence. The characters can't explain him either.

I see 😅

What about for self-improvement purposes?

But it mostly worked, and at present, almost everyone views her positively. It helps that it's so long ago that there's no political advantage to be gained by in slandering her anymore.
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Doesn't anyone else get frustrated about them hogging the work?

They have had an outsize influence on all cultures on the northern continents. One was their writing, and the other, all their technological advancements that everyone copied or tried to copy.
What happened to them is pretty clear. It's a pretty Roman empire situation.
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and many other things besides (they lasted a few millennia). In the end, they sort of petered out and got absorbed into other civilizations and transformed, slowly, in the wake of certain events that decimated their population.
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He likes people in general more than he lets on

it is considered an indication (not quite a promise, but close) that the river will not cause general destruction until the next festival. He does grumble about it but he enjoys visiting the festivals.
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More importantly they are fairly idiot proof

Does not mean you can sail from the capital to the city though. Not unless you're up for some white water rafting and hang gliding.
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