When you raise a number to a power, you multiply it by itself. If you multiply any number by 1, it does not change. So, when you raise 1 to a power, you just multiply 1 by 1 over and over again. This also applies to negative powers, where you are simply dividing 1 by 1 repeatedly.
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Any number to the power of zero equals one.
The value of any nonzero number raised to the zero power will equal positive one (1).
By definition, any number raised to the zero power is "one".
Because that value has been established by convention. Any number raised to the power of zero equals one. See the related question.
Any number raised to the power zero is equal to one. (However, 00 isn't defined.)