Can you include some more details?
Answer:
It´s the sinking of the British passenger ship Lusitania, sunk in the Atlantic by a torpedo fired by a German U-boat on May 7, 1915. The number of mortal victims is 1.198 , 128 of them Americans. It was one of the main factors that contributed to turn American public opinion - and in other nations - against Germany.
Explanation:
as Russian was complicated state it was obligated to start changing in order to advance
Answer-
Nazi Germany occupied up in- 1938-45
The Soviet Union occupied it up in-1948-1989
It split up on its own in-1993
