を喜ばせた

made … happy

→ を
phrase Rare #43,019
made … happy The particle を marks the person or people who were made happy. The phrase is in the past tense.
JA: そのプレゼントは妹を喜ばせた。
EN: The gift made my younger sister happy.

彼はサンタクロースの変装をして子供たちを喜ばせた。

He dressed up as Santa Claus to delight the children.

彼が無事に到着したという知らせは家族を喜ばせた。

The news that he had arrived safely delighted his family.

そのニュースは彼を喜ばせた。

The news made him happy.

昨日大統領が行った演説は支持者を喜ばせた。

The speech the president gave yesterday pleased his supporters.