Among all the great powers, the United States was undoubtedly the most unusual, and its overall national situation was also the most complicated.
As a nation of immigrants—especially the most popular destination for immigrants before World War I—the United States was home to many different ethnic groups.
Although they were all collectively called Americans, there were distinctions between people of British, French, German, and other descent.
On top of that, the former slave trade, along with immigrants and illegal entrants from East Asia, had brought together Black, white, and Asian populations in the United States.
More devastatingly, the famous Lincoln had granted Black Americans human rights. Although this allowed the United States to win the Civil War, the conflict between Black and white people had also become an important factor affecting American stability.
It was no exaggeration to say that if the United States eventually fell apart one day, the contradictions and conflicts between races would certainly be one of the most important causes.
Compared with later generations, Black people's human rights were far from secure at this point in time. Large numbers of white people still discriminated against Black people, and some did not even regard them as human.
But several decades had already passed since the Civil War, and Black people were demanding more rights—even the right to become ordinary Americans.
After Australasia and the British Government had stirred things up through a barrage of public-opinion attacks, American demonstrations had grown increasingly fierce. Their demands were no longer limited to withdrawing from the war in Central America, but had shifted toward the issue of human rights between Black and white people, resistance against the US Government's atrocities toward Native Americans, and opposition to the current President Coolidge, among other things.
Putting everything else aside, the United States was