The person said Cuba being under US sanctions is what caused the Pacific side of WWII. What they were TRYING to say is that Cuba has been under sanctions, and that OTHER, unrelated sanctions were the cause of the Pacific side of WWII; but they used indefinite pronouns and therefor had a confusing sentence.
The joke is about the unintended interpretation of the sentence.
The person said Cuba being under US sanctions is what caused the Pacific side of WWII. What they were TRYING to say is that Cuba has been under sanctions, and that OTHER, unrelated sanctions were the cause of the Pacific side of WWII; but they used indefinite pronouns and therefor had a confusing sentence.
The joke is about the unintended interpretation of the sentence.
Ah. So the joke is he’s bad at reading.