Comment by Someone

> I'm confused at what speculative fiction exists from before the 1910s (or thereabouts) which involves FTL?

I bet very little. We didn’t really know how enormous the universe is (https://en.wikipedia.org/wiki/Stellar_parallax: “Being very difficult to measure, only about 60 stellar parallaxes had been obtained by the end of the 19th century”), and we hadn’t known for long that the speed of light is an absolute speed limit.