Final answer:
During Japan's feudal period, warlords fought over territories and amassed power by organizing clans.
Step-by-step explanation:
During the feudal period in Japan, there were frequent battles between warlords. They fought to bring territories under their control and gain more power. They organized clans to fight for them. The correct answer to the fill-in-the-blank question is: 4) warlords, territories, clans.
The feudal era in Japan was marked by a decentralized power structure where powerful samurai styled themselves as daimyos and ruled their lands as independent dominions. These daimyos raised private armies and engaged in constant battles to expand their territories and influence.
Throughout this period, the actual governance was commonly under the control of the military leaders known as shoguns, who commanded the loyalty of the daimyos and their samurai warriors.