请英语高手分析一个句子，这是奥巴马总统的演讲中的一句话，分析一下语法，详细一点！

第一句，It's been a long time coming, but tonight, because of what we did on this date in this election at this defining moment change has come to America.这一刻我们已经等待了太久，但是今晚，由于我们在这一决定性的时刻所作出的选择，美国迎来了它崭新的一刻。 第二句，The road ahead will be long. Our climb will be steep. We may not get there in one year or even in one term. But, America, I have never been more hopeful than I am tonight that we will get there.
第一句中的 change has come to America.与句子有什么衔接关系？在句子做什么成分，为什么没有用从句中的That或which 等关联词呢？第二句中的I have never been more hopeful than I am tonight that we will get there.这一句中的that we will get there.在句中是什么成分，that起什么成分怎么用的？

change has come to America 是主句！ 前面一票修饰 什么时间 XXOO时刻！
I have never been more hopeful than I am tonight that we will get there.
主句 I been hopeful that we will get there....
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这一刻我们已经等待了太久，但是今晚，由于我们在这一决定性的时刻所作出的选择，美国迎来了它崭新的一刻

It's been a long time coming, but tonight, because of what we did on this date/in this election/at this defining moment,change has come to America. change 前加个逗号就可以分辨出来了 I have never been more hopeful than I am tonight that we will get there. 这个句子是两个句子的组合 第一句是I have never been more hopeful than I am tonight. than引导了比较状语从句，not +more表示very，没有哪天比今晚更充满希望（今晚我非常充满希望）。其中i am 之后省略了hopeful(当然语感需要，不要写上) 第二句是I am very hopeful that we will get there.（not more表示very） that引导了hopeful之后的宾语从句，i am hopeful that 是固定用法 两句组合之后就变成了原句，原句也可以写成 I have never been more hopeful (that we will get there) than I am tonight. 希望能帮到你~