〜わけだ
JLPT N3 Nominalizers and explanationthat's why; no wonder; it follows that
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わけだ presents a conclusion that follows logically from the situation, often as a realization. Attach it to a plain-form verb/adjective, a noun with の/という, or a na-adjective with な. It says given all that, naturally this is the case.
Examples
もでたのか。がなだ。 San nen mo sunde ita no ka. Nihongo ga jouzu na wake da.
You lived there three years? No wonder your Japanese is good.
はだから、がなだ。 Kyou wa shukujitsu da kara, ginkou ga yasumi na wake da.
It's a holiday today, so that's why the bank is closed.