Do you realize how incompetent is the Diversity Republic?
At the end of the original trilogy the Empire has lost the war. The Republic gets the power and starts to apply diversity and gender equality policies (you can watch the consequences in the modern trilogy).
So what remains from the Evil Nazi White Male Empire, after losing the war, with no power, no resources, chased by the Republic... is able to rebuild itself in a few decades and even overpower a Diversity Republic, even when this one controls the resources of the whole Federation.
Food for thoughts, isn't it?