Since people seem to enjoy this comment I'm going to talk more about why the Hists are the dominant species of Tamriel.

The hist is a connected hivemind also capable of individuality when separated from each other. In the past multiple Hist Trees have been moved to other planes of oblivion, such as the vampiric hist tree in the realm of Molag Baal which eventually commits suicide or other hist trees which exist in the oblivion plane Umbriel after they escaped the clutches of Clavicus Vile.

The hist is capable of communicating directly with people via psychic connection, through dreams, through magic devices (which it is capable of crafting itself), or even through wind and windchimes. The hist is also capable of taking souls which would otherwise be captured and storing them within itself for safekeeping even against ancient and powerful elven technology.

Sometimes the Hist sleeps, or weakens due to outside interferences, causing entire generations to go without hearing its' voice. Some argonians entirely lack the ability to communicate with the Hist. However, the Hist is still capable of communicating with other races if it chooses to.

The Hist has an ancient history with the elves who created Tamriel and who were fooled into sacrificing their immortality. Some modern elves depict Argonians as servants created for slavery by the elves rather than accepting the sovereignty of the Hist or even the sentience of the Argonians. Multiple uprisings have occurred as the Argonians endure assault and enslavement throughout the ages, their subservience solely to the hist preventing them from organizing against anything less than an existential threat. The Hists differ greatly from the Wyrd Tree and traditional elven nature spirits, the Ehlnofey, who are a chosen few of the ancestors of all elves tasked by the Bosmeri god Y'ffre of song and nature whose presence is still felt in the regions ruled by the Green Pact, which is a sentient forest comparable to the Hist network. It's assumed that all of these things are interconnected in their origins but it's never been elaborated how or why.

Some popular unconfirmed fan theories are that the ancient elves never stopped researching ways to regain their immortality. One method they pursued was becoming one with nature, producing the Hist as a byproduct of that research, which was actually successful in the cases of Y'ffre and also the Wyrd Tree. This theory also accepts that the Dunmer's collective instantaneous disappearance from Tamriel was a result of similar research, that they basically raptured themselves. The Dark Elves of morrowind were also successful at creating a Divine vessel, whose parts were scattered in a daedric plot and divided amongst the three living gods of morrowind.

During the Planemeld Crisis and again during the Oblivion Gate Crisis the Argonians were the racial factions whose territory suffered the least. The Argonians actually invaded Oblivion in both events and overran the Daedre.

Do not fight the Hists. You will lose.