Countries rarely admit, or accept, that they made historical mistakes. They say things like "At the time, the action/decision was the right one to take" or "We must not judge the past by the standards of today". Other countries might well think they did make mistakes.
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Britain did, holding over 1/4 of the total land mass, 'The British Colonial Empire'
As i see it history, if we know it, alows us to lean from others mistakes without having to suffer under them ourselves. History dousn't MAKE us do anything.
So that we can learn from our mistakes.... "those who do not study history are doomed to repeat it...."
The biggest explosion in history was the detonation of the Hydrogen bomb in the Bikini Atoll in the 1950s.
History is studied to learn of the mistakes and successes of humankind. With such knowledge, successes can be made to fit modern times and mistakes and errors of the past can be avoided. History can also be studied simply on the basis of seeing what events happened in the past.