The Japanese justified their imperialism in multiple different ways, depending on what territory is in question.
For China, there was a fake attack on Japanese property, performed by the Japanese themselves, so they invaded Manchuria with the justification that their citizens were in danger.
Korea and Taiwan were justified in the sense that some countries had colonies which they used for resources and as market for their products, so the Japanese justified it in the manner that they also deserve to have such territories.
For some territories they conquered there was no real justification though, and the Japanese didn't really bothered with making excuses anymore.
THE ONE THAT FOR BASIC NEEDS OF THE WAR REFUGEES
The correct answer is: "a cultural mediator".
Sacagawea was an indegenous woman from the Shoshone indians who participated in the expedition leaded by Lewis and Clark, as a guide. She arrived in the expedition with her husband, Toussaint Charbonneau, who was a French explorer.
The expedition aimed to explore the Western regions of North America, beginning near St. Louis and ended up reaching the current state of Oregon. It took place between 1804 and 1806.
She was crucial in her contributions as guide, indicating how to safely arrive to the Pacific Ocean, but also because she established cultural contacts with the different groups of native people that they encountered in their way.
