Hinduism is a religion, not a country.
Hinduism is a very broad spectrum subject. It is taught in Sanskrit, Hindi,or English in Gurkuls, Universities, Schools and Colleges through study of Vedas, Upnishadas and Gita.
The only country as Hinduism as their national Religion is Nepal. In India Hinduism is not a national Religion.
80% of Hinduism is found in India were Hinduism was "born".
Buddhism taught Hinduism Non Violence & Peace. Islam taught to accept different belief & rituals, also some of the rituals were affected.
Teachings of Lord Brahma or brahman is the base of Hinduism. Lord brahma taught first man Philosophy of life and way of living, it is now known as Hinduism.
Hinduism first began in the great country of India. Mythology states that hinduism began in modern kashi in India.
Islam.
Many countries believe in Hinduism. India Nepal Mauritius & Myanmar.
Hinduism is mostly in India.
In the U.S
India