There were on the order of 1000 senators in the senate. It seems the Star Wars galaxy was incredibly vast with millions of systems.
In light of this, it seems a bit strange that Naboo would have a seat on the senate. As best I can tell the world is fairly nondescript and inconsequential from the content shown/discussed in the movies.
The senate was a relatively small representation of the overall galaxy - why was Naboo important enough to get a seat on the senate?
Either canon/legends answers are fine.