Answer: Firearms and gunpowder.
Explanation:
Firearms and gunpowder had allowed Hideyoshi and others to enforce them in Japan during the Sengoku era. This era had lasted very long, from 1467. year to 1603. After this period Tokugawa Shogunate had begun and Oda Nobunaga was first to use those kinds of technologies. He ordered 500 matchlocks and gave them to his army. They were used successfully.
