WWII Start Dates Clarified

FDR's "Day of Infamy" speech cemented Pearl Harbor as the entry point for the US, shifting public opinion and enabling war declarations. The debate around earlier dates often involves the Sino-Japanese War, particularly Japan's invasion of Manchuria in 1931 or the Marco Polo Bridge Incident in 1937. These events are viewed by some historians as the true beginning of global conflict, preceding the European theater. Different countries emphasize different dates based on their own experiences and perspectives of the war's impact. This leads to varied interpretations of when WWII truly began on a global scale.