butの意味とある英文の意味がわかりません
1.
Dr.King dreamed of a country where "For Whites Only" signs world would come down everywhere, and people of all races could sit down together at the same table. He dreamed that "my four little children will one day live in a nation where they will not be judged by the color of their skin but the content of their character."
2.
Forty-five years later, in November 2008, Barack Obama, an African-American, was elected President of the United States. It seemed as though Dr. King dream had come true.
1の英文の
"my four little children will one day live in a nation where they will not be judged by the color of their skin but the content of their character."の途中にあるbutはどういう意味で用いられているか,
2.の英文のIt seemed as though Dr. King dream had come true.の英文はどういう意味かわかりません。
どなたか教えていただけないでしょうか?
