Why was martin luther king, jr. famous?
a) he was a powerful civil rights leader
b) he was the first black college professor
c) he wrote a famous book of the slave trade.
d) he was the first surgeon to perform open heart surgery

dont know

explanation:

the triple alliance. germany and austria-hungary were already allies by 1879 when, worried about a threat from russia, they formed the dual alliance. italy joined the group in 1882. there was a concern about a possible attack from france and the alliance needed powerful friends to defend it.