せいで details

write + because of

kaku sei de

because of; on account of — blaming an unwanted result on N

電車でんしゃが遅おくれたせいで、遅刻ちこくしちゃった。

densha ga okureta sei de, chikoku shichatta.

Because the train was late, I ended up being late. casual

天気てんきが悪わるかったせいで、試合しあいは中止ちゅうしになった。

tenki ga warukatta sei de, shiai wa chuushi ni natta.

Because the weather was bad, the match was called off. neutral

Examples

because of; on account of — a cause blamed for a bad result

電車でんしゃが遅おくれたせいで、遅刻ちこくしちゃった。

densha ga okureta sei de, chikoku shichatta.

Because the train was late, I ended up being late. casual

天気てんきが悪わるかったせいで、試合しあいは中止ちゅうしになった。

tenki ga warukatta sei de, shiai wa chuushi ni natta.

Because the weather was bad, the match was called off. neutral

担当者たんとうしゃの確認不足かくにんぶそくのせいで、納品のうひんが遅おくれました。

tantousha no kakuninbusoku no sei de, nouhin ga okuremashita.

Because the person in charge failed to check properly, the delivery was delayed. formal

Sentence-final せいだ assigns blame as its own predicate (それは彼かれのせいだ
"That's his fault"), distinct from the mid-sentence connective せいで above.

から
から states a reason with no judgment attached (電車が遅れたから、遅刻した merely reports cause and effect); せいで frames that same cause as being AT FAULT for a bad result — swapping から in strips the accusatory edge せいで carries.

おかげでplain-antonym
Same Nの／な-adjな frame, opposite valence — せいで assigns blame for an unwanted outcome (雨のせいで中止になった), おかげで credits a welcome one (先生のおかげで合格した); swapping them into the wrong outcome reads as either backhanded thanks or misplaced blame.

Pattern	Attaches to
おかげで