「〜なかったので」 means 'because I didn't have/do ~' or 'since ~ didn't exist'. It combines the past negative form of a verb/adjective with 「ので」, which indicates a reason or cause. It's a way to explain the background or reason for an action or situation.
「〜なかったので」は「〜がなかったから」という意味。過去の理由を説明する。
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