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Japanese with a large amount of info on Japanese history (as well as Chinese and so forth).
Found this thread from google, usually people have no idea what they are talking about when it comes to Japan, so I will give you my slightly more educated thoughts.
The golden age of Japanese history to me, and many others in Warring States period to Edo.
These are also the most likely for ability to colonize.
From 1500's on Japan had reached a top level of war strategy, training and equipment that could theoretically go toe to toe (and in my opinion defeat) armies from anywhere else.
Part of this also came from the lasting unity of Japanese people, and the relationships formed between daimyo or lords, and their retainers, all the way down to ashigaru foot soldiers in some cases.
Other armies were and continue to be divided, fighting for their own individual causes alone, seperated at heart.
However. The Daimyo system which prevailed even after Tokugawa took over meant that we were one Japanese people, but we served under different lords, with different feelings.
But samurai were bound by their strong values, such as loyalty and honor, which would in fact prevent some from being tyrants to the people of other lands if they did take them over. Most likely, many lords who took pride in their domain, would want to add another countries territory to their own, and run it just as well. A poorly run domain with unhappy people or tyrany would be shameful indeed.
As you may know, when the big Korea campaign was launched, it was not actually motivated by Japan to expand. To Japanese, partly due to Shinto, Japan is the only home, and the only divine land. And there is no point in leaving.
The campaign was in fact organized because the great battles had ended, peace was supposed to set in with a united country, and yet, we were still full of ambitious men who still desired more out of life, and thought true death was not found in bed, but on the battlefield. Korea was attacked to theoretically save Japan from dividing again.
And many Samurai either refused to go, or went onlyout of loyalty, such as Date Masamune. Most warriors who went to Korea fought honorably, and highly respected their opponents.
Eventually China and Korea banded together, yet it is well documented that they stated that even together they could not defeat Japan. (So no, Japan was never scared of China or Korea, they stopped fighing them on any large scale because the war was not truly motivated, and most great samurai did not want to leave Japan).
As for America. Date brought katana to the Pope (he faked being both Christian and Catholic so if the shogun ever tried anything he would have his choice in who backed him up in telling the shogun to back off). He made the ship go to America to see what was there. They walked across Mexico then sailed to Europe from the other side.
He was a great undefeated warrior who would have been a great candidate to take over other lands, as well as Oda, Tokugawa, Takeda, and so forth. But he had no desire. He like many others only cared about his home of Japan, and maintained it well.
Also Toyotomi had maps drawn up, of how Korea and China would be split into territories for each daimyo. This tells us how it would have worked, the same way as it did in Japan most likely. But also tells us much due to the fact that the promise of these territories did not entice most samurai.
So that is my opinion on Samurai and colonies. As for Imperial's, they are shameful and should not represent Japan, and we can tell that they would not have been kind to their colonies, and they were also not successful.