Japan was a threat to the US's Pacific territories, and those of other European powers. China was not.
Unlike China, and every other Asian nation at the time, Japan had defeated and humiliated a European power in the Russo-Japanese War. They defeated Russia not only on land, but also at sea where European powers typically dominate. Even if it was the ailing ...
One angle I think a lot of people miss (particularly non US people) is that, being a former colony that had to fight for independence itself, the USA during that period very much liked to identify itself as being an anti-colonial power. Yes, I know that this attitude didn't mesh too well with the reality of its existing position in the Philippines, but this ...
You answered your question yourself:
To a large extent, US pressure seems to have in response to Japanese
aggression in China. An aggression which involved atrocities such as
the Rape of Nanjing.
This was an atrocity beyond anything people had experienced, apart from trench warfare. That fact alone was more than enough reason. Most western nation ...
The Japanese navy was the second biggest in the Pacific Ocean.
The Japanese navy had the most modern and most experienced carriers of the world at that time.
England, France and The Netherlands were at war in Europe. France and The Netherlands were occupied by Germany.
The colonial forces of FR, GB and NL were more like expanded police forces for internal ...
Your question has several criteria:
Country is invaded by a foreign power
A "democratic" system is imposed upon the people who live there by the foreign power
After the foreign power leaves a "democracy" remains.
Examples of this are legion. Here are a non-complete list of countries that experienced this: