Going back to the early 20th century, although India was a big producer of tea, consumption of black tea within India remained low, until various campaigns by the Indian Tea Association to promote tea. The official promotion of tea was as served in the English mode, with small added amounts of milk and sugar. People in India added the spices, that we now associate with masala chai. The staple players being cinnamon, cloves, ginger, cardamom, fennel and pepper; we have them to thank for that. And exactly for that reason, there is no one recipe for masala chai. For as many various regions as there are in India, there are just as many ways to make this spiced beverage. And, of course, it has now evolved. Guidelines will still include some spice but not always the black tea; spiced chai can now be with rooibos, green or white tea as a base.
You can find our chai teas here