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.
Anything long ago like, tools, vases, pottery, etc
Because of his actions being similar to his own
He took control with doing what he wanted. he was kind of a dictator but also people wanted him as leader because of WW1
Jefferson opposed the nation bank that was proposed by Alexander Hamilton because he believed it would make the federal government too powerful over the states--limiting their economic freedom.