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What was the first language to use conditional keywords?

The if keyword is so prevalent in programming that it seems to just be part of it. However, with an integer value and a goto statement, one can easily simulate the functionality of an if.

Which means it's not necessary for a language to have dedicated conditional keywords in order to achieve that functionality. Which in turn makes me think that there must have been a time before somebody created the first if to be used in a language.

So, my question is: What was the first time a language offered a dedicated keyword for conditional execution?

The word itself doesn't really matter here, it could be AS_IT_OCCURS_THAT instead of if for all I care.