南蛮貿易
In 1543 Portuguese traders arrived in Japan initiating the first contacts with the West. Soon they established a trade route linking their headquarters in Goa, via Malacca to Nagasaki. Large carracks engaged in the flourishing "Nanban trade", introducing modern inventions from the European traders, such as refined sugar, optics, and firearms; it was the firearms, arquebuses, which became a major innovation of the Sengoku period—a time of intense internal warfare—when the matchlocks were replicated. Later, they engaged in triangular trade, exchanging silver from Japan with silk from China via Macau.