Most sump pumps, at least in my area, drain directly to the outside, there’s basically a pipe that goes from my sump up and out of my basement and opens out into my yard.
I wouldn’t really want to count on a sump pump for this kind of issue though. At best you’re basically just putting a bandaid on a sucking chest wound. You could also run into some legal issues for knowingly using it to discharge sewage into your yard (and why would you even want to do that in the first place?)
It would also be pretty rough on the pump, they’re usually not meant to handle solids like the hair clogs, bits of food, fecal matter, etc.
Assuming you’d have an actual sump pit installed, there’s often some water left standing in the pit, you probably don’t want that to be sewage water.
I’d probably push it back to a little over 100 years to include WWI, the fall of the Ottoman Empire, and the British Mandate for Palestine, since that all set the stage for Israel being founded pretty directly, and there had already been a pretty substantial movement for Jews to immigrate to the region by about the '30s (known as the “Fifth Aliyah”) so a bit outside of your 80 year range.
But of course, none of these events happen in a vacuum, if you want to get really nitpicky, you can start talking about the events that led to world war 1, trace them way back, through the crusades, the birth of Muhammad, Christianity, the Roman empire, all the way back to the bronze age, and maybe even further if you were able to somehow find decent historical records going that far back.
Trying to point to one single event as the one that kicked off a certain conflict is tough, because there was always something that led up to that event too, and when you try to unravel it, before too long you might come to a very Douglass Adams-y conclusion that it all started when our first ape ancestors decided to come down from the trees, only for someone else to say that the trees had been a mistake in the first place and that we never should have left the oceans.