He contributed to the invention of the radio
Answer:
a
Explanation:
a because the blacks were known to have no power and he wanted to change that
The Southern Song (Chinese: 南宋; 1127–1279) refers to the period after the Song lost control of its northern half to the Jurchen Jin dynasty in the Jin–Song Wars. ... In 1234, the Jin dynasty was conquered by the Mongols, who took control of northern China, maintaining uneasy relations with the Southern Song.
