Homeopathy was developed in the late 18th century by Samuel Hahnemann, a German physician. Hahnemann developed the theory that a substance that causes similar symptoms in a healthy person can cure those same symptoms in a sick person. He called this theory the "law of similars", and it is the basis of homeopathy.
In the early 19th century, Hahnemann began practicing homeopathy and teaching his techniques to other physicians. It quickly spread across Europe and then to the United States. In 1844, the first homeopathic hospital was opened in New York.
During the 19th century, homeopathy continued to grow in popularity in the United States and Europe. Many homeopathic doctors graduated and started to practice, and many homeopathic hospitals were opened, and soon it also spread to other continents such as Africa, Asia and South America.
In the early 20th century, homeopathy continued to grow in popularity, but it also faced resistance from some mainstream physicians. However, it continued to be practiced and studied, and many advances were made in understanding its techniques and principles.
Today, homeopathy is a global practice, with many doctors and health professionals practicing and promoting its benefits. There is still a lot of scientific controversy about its effectiveness, but many people report significant benefits from its use.
Source: "The history of homeopathy" Melinda R. Fink