Meeting myself in an Alternate Universe

There are many planets and galaxies, so there are many universes perhaps infinite numbers of them. They're referred to as alternate universes. Each time we take a decision, we split in two, like a fork in a road, take another decision, we split again and so on. Therefore, each of us, as an individual exist in infinite numbers. Each can be called a copy of original one, but no one knows who is original or real! Where are these individuals are living? Well, they're living in alternate universes. Knowing this, an extraterrestrial (ET) belonging to a very advanced civilization, travel from an alternate universe to our universe to meet a copy of himself on our planet, Earth. He lands first in a major city in North America and continue his journey to rest of the planet. This book is about his adventures on Earth and meeting his copy or Earthling-self.