What factars motivate japan to begin extending its power outside of its national borders?

There were few factors that motivated the Japanese to start extending their power and territory out of their borders. Some of the most important factors were:

- Strong military

Japan modernized its military, had good and modern equipment and good training. That made their army superior in the region.

- Weak opposition

The nations on which Japan has set its sights on were either very weak, or had internal problems and were not unified nations.

- Natural resources

Japan is a nation that desperately lacks in natural resources. In order to be able to develop further and set its foundations for the future, Japan started occupying areas that were rich in natural resources.

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the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).