The answer is (True) congress does have power to override .
The statement in Martin Luther King Jr.'s "I Have a Dream Speech" is trying to point out South's racial problems. But the sad part is that it is ignored racial injustice that you can find in the North is not true. Nevertheless, the whole speech is focused more on the South's injustices that is also recognized in the South.
The fourteen points speech of president Woodrow Wilson was an addres delivered before a joint meeting a congress on january 8, 1918, during wihch Wilson outlined his vision for a stable,long lasting peace in Europe,the americans and the rest of the world following world war I
Thoureau wanted to poit to the fact that following traditions limits us and deprives us from developing our imgination. Thoreau, like other romantic authors, does not agree with tradition. He thinks it prevents people from finding true greatness and blocks their path to spirituality. "Castles in the air" are simply illusions by which people persuade themselves in something that is not true, in Thoureau's opinion.