Can someone explain to me what these sourses mean and how they relate to nationalism? (just so i have an idea of what i am going to write about)

SOURCE 1
"the lines of red are blood, nobly and unselfish shed by men who loved the liberty of their fellowmen more than they loved their own lives and fourtunes. God forbid that we would ever use the blood of America to freshen the colour of the flag. But if it should ever be necessary, that flag will be coloured once more, and in being coloured will be glorified and purified." - Woodrow Wilson, flag day speech.
SOURCE 2
"No matter how this aim sounds, this new century must become the century of humanity, when we as human beings rise above race, creed, colour, religion, and national self-interest and put the good of humanity above the good of our own tribe." - Lietenant-General Romeo Dallaire
SOURCE 3
"Nationalism is an infantile disease. It is the measles of mankind." - Albert Einstein

2 answers

Source 1:
Wilson related the red stripes in the American flag to blood shed by patriots as they fought for liberty. He also said that if we have to fight, the red stripes on the flag will be honored. He's implying that the U.S. is superior.

Source 2:
Dallaire is rising above nationalism in favor of the good of the people of the world.

Source 3:
Einstein insults nationalism, calling it a disease of childhood.
Could you tell me what kind of nationalism they might be? (just so i get an idea)