the meaning of となった in this context is not entirely clear for me. Help, onegai.
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First, note the translation of the word in question:
Furthermore, note that putting a verb before a noun is a way to describe the noun. For example:
So basically, the whole first part of the phrase (up to and including となった) are used to describe the noun after it: "ニューヨーク株式市場"
The New York stock market which became the origin of a worldwide simultaneous period of low stock prices ...