What we see in this blue area is what the first Mughal emperor, Babur, is able to put under his control, which includes the region of Punjab, which is where Sikhism begins and thrives to this day. We see later emperors like Akbar continuing to expand the domain of the Mughal emperor, with Aurangzeb, the least tolerant of the Mughals, expanding well into south India. It all starts in the 15th century with the birth of who will eventually be known as Guru Nanak. He's born into a merchant class Hindu family, and he's known to be precocious from a very young age, especially when it comes to matters of spirituality. He's constantly questioning. He goes and learns about various religions. Remember, north India is under the control of the Muslims, but it's a Hindu majority population, and you also have populations of Christians and Jains.