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

耶鲁公开课 - 美国内战与重建课程节选

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

耶鲁公开课 - 美国内战与重建课程节选