Elves and Humans have coexisted for thousands of years. Their customs and beliefs are much different, but that doesn't stop them from living together. Their planets are connected by only three portals. All portals are housed in the United States. English has become the primary language of the entire elven world. In elven culture, cities are ruled by kings and queens. In a specific city, the princess would have two private guards. The guards would give their lives for the princess.
One specific king had a human wife. Their daughter was half elf, and half human. She had no elven features. The king's wife left the king only when the daughter was only a year old. She took their daughter. The guards of the princess couldn't stop them. It was useless. The guards couldn't harm the queen. The king could do nothing but accept the fate of his daughter. He wanted to search for his wife and take his daughter back, but she had fled to Earth. The king couldn't defy the laws of America without starting a war he wouldn't be able to win. Since that day, no human ever stepped foot in front of any elven royalty.