Many tribes live in the galaxy society. Depending on the planet, there are a variety of population, thought form, appearance and so on.
Toggluta, Bis, Moon, Wookey, Sablak, Ambara, Geionosian, Human ... ... If you say, there is no dirt.
Among them, humans are the protagonists of the creation of the Republic, and in the later Empire, we discriminated against other tribes. In the Republic era, the supreme chairmen of the succession had abolished discrimination, and had a multi-ethnic community as a philosophy.
Corruption and corruption of prolonging senior citizens, under the old Constitution, democratic politics between different races of thought might have been limited.
Opinions fall apart, it takes time to resolve, and it will eventually divide. Therefore, the dictatorship proposed by Palpatine, who emphasized the emperor, permeated the galaxy that human beings are the most suitable for governing galaxies with excellent races. In fact, there were races with higher ability than human beings, but human beings are the most populous in the core. If Palpatine were not humans, it might have been different. In fact, pulpatine had a sense of superiority in being human.
Well, if you are sensitive to the Force, you were welcomed at the Jedi Shrine at a young age regardless of the race. Yoda is the central figure who gathered the ethnic tribes. Yoda never revealed his tribe. If I reveal it, I can not make an important "objective judgment" in leading the Jedi Knights. (The way to keep your tribe not revealed may have been to forget about your birth.) (Wookey lives longer, but not as much as Yoda's tribe)
Yoda does not teach about birth to a baby coming to the shrine. I can understand that the existence of my family is troublesome in the case of Anakin Skywalker.
Yoda lived for hundreds of years. If the galactic society recognizes that there are many races similar to Yoda, the life principle of the galactic society will change from the fundamental.
Star Wars is built following the history, philosophy, and academics of the earth which human beings have just created, but if one life is hundreds of years long, that assumption does not hold. Lucas reflected the human society that is being chased by time in the world of Star Wars.
Life is only once, its lifespan is limited.
Both Jedi and Sith were looking for ways to make immortality possible for a long time. However, only the dozen play gas was brought close to it. Yoda became the Force's spirit body.
Siddias will clean out the play gas. If Play Gas practiced a way to make immortality possible, Siddias was alarmed that he could not be a master until he died.
Like other lives, Palpatine knew that life expectancy was not eternal. That is why I inherited and thought through frantically the way I could control power in a short time.
In the end human beings are not qualified to make immortality possible. Even if it is realized, something can be accomplished, for example, it is not always possible to contribute to civilization.