Basically humans are familiar with the water from inside the womb. In other words, while in the womb human has been able to float in water. So basically all humans can swim. Only, because many children are not introduced to the world of water so they are afraid to play with water.
As the basis of this statement, you can see the history books note those human beings actually been able to swim since prehistoric times. There is plenty of evidence that supports this fact. The earliest evidence we can find out through the paintings of swimmers from the Stone Age have been discovered in the ‘cave swimmers’ in the area of Wadi Sora, Gilf Kebir, southwest Egypt. In addition, we also can note about this oldest of the Epic of Gilgamesh, Odyssey, Iliad, Beowulf, and Bible. You can read this topic in the book of Ezekiel 47:5, Acts 27:42, the Book of Isaiah 25:11. Nikolaus Wynmann is the first person who write book about swimming in 1538. The title of this book is “Der Schwimmer oder ein über die Zwiegespräch Schwimmkunst” or in English “Dialogue on Art Swimmers.”
Swimming race was first held in Europe in 1800 after the construction of swimming pools. Most participants had time to swim with the breaststroke. In 1873, John Arthur Trudgen introduces front crawl style or a style called trudgen in the race pool. Trudgen imitates the techniques of freestyle in the South American Indian tribes. Swimming is one sport in the 1896 Athens Olympics. In 1900, backstroke was included as a new number the Olympic pool. The Federation Internationale de Natation (FINA) was formed in 1908. Butterfly style which at first is one variation of the breaststroke was accepted as a separate style in 1952.