Which innovation allowed for the mass production of goods? Question 6 options:

1)

Cotton gin

2)

Interchangeable parts

what are the others?

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.