Because they were mostly friend
Unlike Britain, France, Russia and the United States wanted to keep trade in China open. It might be added that it was the U.S who implemented the "Open Door Policy" with China in the first place.
Answer:
It was signed into law on March 11, 1941, and ended in September 1945.
Explanation:
not quiet sure what your were asking here but those are the dates it started and ended. feel free to expand on your thought so that I can give you a better answer if that wasn't what you were looking for! :D
The correct answer would be D. Have a blessed week!