What scientific breakthroughs did African Americans make

The Three-Light Traffic Light, Invented by Garrett Morgan in 1923. With only an elementary school education, black inventor (and son of a slave), Garrett Morgan came up with several significant inventions, including an improved sewing machine and the gas mask.

The creation of the Open Door Policy increased foreign influence in China, which led to a rise in anti-foreign and anti-colonial sentiment in the country. The backlash against foreigners led to widespread killings of missionaries working in China and an increase in nationalist feelings among the Chinese.