Catherine the great built on peter the great's accomplishments by a. sponsoring russian expansion across siberia and the bering strait. b. allying with poland to expand russia's european territories. c. destroying the wealth and privileges of the nobility. d. acquiring new territory and expanding serfdom.

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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.