Had those powers lasted longer, probably not, but since the Second World War the USA has become by far the most destructive and exploitative (state) force in world history, replacing Britain (who replaced probably Spain who replaced probably the Mongols or Timurids or something). Idk if this poll means solely colonialism, because in that case the US would be limited to its Westward Expansion, but I think imperialism should be included as well and in that case the US is always #1.
The US (western expansion)
That's a yes, just colonialism, not imperialism. Not to say that the US wasn't an awful colonial power but it's not indisputably worse in that regard than some of the others, like Spain.
Though technology does play a rather large role in this entire affair. The majority of the above colonial powers didn't use biological warfare and experimentations on their colonial conquests to the extent of the Japanese but it was more capability than unwillingness and the worst of it came during a period of total war with some of the largest empires in human history. Of course, they did participate in other atrocities(Nanjing, the Philippines, etc.) that, while short, were on par with the worst colonial policies in addition to the standard 'strip of their language, culture, and try assimilating them.'
In terms of long term impacts, well, Japan unintentionally managed to shatter two nations that had been unified for most, if not all, of the past 1000 years (China and Korea) and were beginning to industrialize and modernize into states of neverending civil war and their industrial contributions to both were either destroyed (in the Korean War) or looted and carried away (the Soviets in Manchuria). So their overall impact leaves a bit to wish for, since a bunch of colonial powers could at least try to vindicate themselves by claiming that they improved the living standards of their subjects in the long term or exposed them to the outside (pretty crappy excuses but it's what they've got) and Japan's only effect now is the Chinese and Korean Wars that still haven't been resolved. Not sure if that counts but it's worth consideration, I think.