India is a country with a rich history and culture. Home to the Indus Valley civilization and a region of historic trade routes and vast empires, the Indian subcontinent was identified with its commercial and cultural wealth for much of its long history. Four major world religions, Hinduism, Buddhism, Jainism and Sikhism originated here, while Zoroastrianism, Judaism, Islam and Christianity arrived in the first millennium AD and mingled into the region's diverse culture. India became a modern nation-state in 1947 after a struggle for independence that was marked by widespread nonviolent resistance. The history of India can be divided into four major segments, the ancient era, the medieval era, the modern era and the post-independence era.