The second great reform era is the Progressive era, a great response to urbanization, industrialization and immigration, as it had never quite happened before.
第二个时期是进步时期，对于城市化的大力响应，工业化和移民入境，这是之前从未有过的。
The second great reform era is the Progressive era, a great response to urbanization, industrialization and immigration, as it had never quite happened before.
第二个时期是进步时期，对于城市化的大力响应，工业化和移民入境，这是之前从未有过的。
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