求翻译：That is why Dr. Martin Luther King could stand on the steps of the Lincoln Memorial and ask that our nation live out the true meaning of its creed. That's why immigrants from China to Kenya could find a home on our shores; why opportunity is available to all who would work for it; and why someone like me, who less than 50 years ago would have had trouble voting in some parts of America, is now able to serve as its President.是什么意思？

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