求翻译：Of course, the story of our nation is not without its difficult chapters. In many ways -- over many years -- we have struggled to advance the promise of these principles to all of our people, and to forge a more perfect union. We fought a very painful civil war, and freed a portion of our population from slavery. It took time for women to be extended the right to vote, workers to win the right to organize, and for immigrants from different corners of the globe to be fully embraced. Even after they were freed, African Americans persevered through conditions that were separate and not equal, before winning full and equal rights.是什么意思？

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