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.
indigenous people, poor leadership in their own community, the extreme heat and cold of Virginia's climate, and the fact that they were, overall, woefully unprepared to survive in such harsh conditions.
I hope its not too late to answer...
the people farther away from rome were more prone to attacks and raids, news from rome took longer to reach them, they were not as controlled due to lack of reinforced rules and lack of guards
