Humans have both alien and Earthly origins. We are all from Earth and all of us are from the stars. Everyone is a starseed in a sense of ancient genetics. Since the first humans were created from Earthly hominids, we had infusions of alien genetics many times since many aliens were coming to Earth throughout history and formed colonies. They enhanced human genetics with alien genes and gave the new humans elements of culture and social structure. Aliens from Orion created first Arian states in the areas of Armenia and parts of India. Star people from Sirius formed ancient states in Syria, India, Egypt and Dogon in Africa. Ancient Mayan state was a colony of Pleiadians from the planet Maya of Taygeta star in pleiades. Modern hierarchical structure of government and law comes from Orion culture. Ancient numbering systems based on numbers 12 and 60 have come from the stars. They are still used in astrology, geography and time measures. The prehistoric hebrews from the times before egyptian captivity were the colony of yahyel.
It is important to understand that very few of the alien races were able to live on earth because the earth had a lower vibration, a lower density. So the creation of human hybrids based on earth genetics and creation of human states was for them only an investment in a distant future with the hope that our species enhanced with their genes will develop, evolve and ascend. Once we ascend to the 4th density, our bodies will become suitable for the incarnation by star people souls.
It is also a common practice in creation to seed 3rd density planets and help them in their evolution to 4th density. Most 4th density civilizations were created this way - they started from 3rd density and evolved to the 4th. It is also the common practice to keep 3rd density civilizations under quarantine, the prime directive. Importantly, the aliens who seed new civilizations are under divine guidance and usually are in bi-directional communication with creative divine guidance. The ascension is usually achieved by the development of telepathy by a civilization, uniting the civilization into a coherent collective mind. This coherent bonding is the driving force of the dimensional jump to the 4th density.
In addition to ancient alien hybridizations, there are new infusions. The seeding of alien genes never stopped. A new wave of infusions started in the 1960s and continues to this day.