Proportional Change (As X, So Y)

3 related grammar points that express the same core idea - compared below so you can tell which one to reach for.

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～につれて JLPT N2
～にともなって JLPT N2
Noun と相まって JLPT N1

につれて / にともなって

One change brought another along with it.

～にともなって vs ～につれて: にともなって allows a one-off event as the trigger (法改正にともなって) and is the more formal of the two. につれて needs both sides to be gradual and continuous, so a single discrete change sits badly with it.