Tawantinsuyu
Core:
History: Tawantinsuyu ("The Four Regions" in the native Quechua) is the most powerful, oldest, and first of the native empires in the New World. Founded in 1438 by Pachacuti, after reforming the Kingdom of Qusqu (spelled Cusco in most european languages) into Tawantinsuyu. Known as the Inca Empire after it's absolute monarch, the Sapa Inca, which is the equivalent title to an Emperor in Europe. It went to conquer much of the western coast and interior of the Southern continent of the New World, and it had no rivals until roughly the European year of 1480, when The Great Ming came into contact with the Empire.
The Chinese were shocked upon seeing Inca society, as they were the most advanced of the people's they had met before on the New World, and compared them to her own neighbors, specifically Korea and Japan. The Inca on the other hand were dumbfounded by the Chinese, and their technology, especially their horses and their ships. Like all other Chinese expeditions, trade was started, and and in exchange for some Incan gold, among other goods, which the chinese took as tribute, the Inca gained some chinese weapons, and horses.
With the introduction to Horses to the Sapa Inca's court, the Inca's military would become the greatest on the continents, at least until the arrival of the European and Moroccan powers, and by then the Horse was fully integrated into the Incan military, and even way of life, providing a great advantage to farming and other aspects of life.
After the initial contact with china however, Inca-Sino relations were not always peachy keen, and for many years the Sapa Inca Huayna Capac refused to send the tribute the chinese demanded, because why would a living god send tribute to an emperor who only rules in heaven's name? However after a little while, and a small but strong show of force by the Chinese, tribute was established, and trade commenced, and the Inca began to "Easternize" and by the time Europe came they were already armed with horses, very simple guns (though european guns were still more advanced), and some resistance to old world deseases (some parts of the empire had yet to face against these terrible microbes but others had already suffered and were beginning to recover), and when Pizarro came a knocking, the Inca knocked back, hard, and strong. Taking Pizarro's guns and any surviving men as prisoners and slaves, the Inca reversed engineered the european weapons, easily crushing a rebellion in the southern province. Every attempt by Europe to conquer the Inca was met with failure, they either sent too little, or were bogged down fighting in the mountains, or got embroiled in their own petty squabbles, allowing the empire to recover from the plagues, and reassert herself as the strongest nation on the Southern Continent.
Today the empire is a hodgepodge of Quechua, with Chinese and various European influences, their religion reveres the Sapa Inca like a god, similar to how in Ancient egypt the pharaoh was worshiped, or the Japanese emperor is in Shintoism, however the Inca religion has long been relatively syncratic, and they have taken many concepts from Christianity, Buddhism, Confucianism, and even Islam and melded it into her own practices. Their military is home brewed, but has many european and chinese influences, and with clockwork technology coming to the forefront, and the Ether beginning to be researched, the Sapa Inca is doing all in his power to fund new advances in technology and grow his power, and the power of his empire.