に大きな影響を与えた

had a major impact on

→ に
phrase Rare #39,897
had a major impact on Used to say that someone or something had a major influence or impact on a person, group, field, or situation. The に marks what was affected.
JA: その映画は私の考え方に大きな影響を与えた。
EN: That movie had a major impact on the way I think.

その政治家の死は政界に大きな影響を与えた

The politician’s death had a major impact on the political world.

彼は周囲の人達に大きな影響を与えた

He had a major influence on the people around him.

彼の言葉は私の人生に大きな影響を与えた

His words had a profound impact on my life.

この小説は若い人に大きな影響を与えた

This novel had a major impact on young people.