Why was the sinking of the Lusitania a driving factor toward American involvement in the war? A. There was a large amount of gold onboard that were lost
B. The Germans had promised to let the passengers off first, which they didn't
C. It was an American ship attacked, even when the US was neutral
D. A large number of Americans were killed onboard

C. It was an American ship attacked, even when the US was neutral

Explanation:

The US was neutral at the time, and the sinking of the ship led to hundreds of innocent Americans dying.

The sinking of the Lusitania created strong tensions between Germany and the US and led to the US entering the war on the Allies side.

because of the war the westeners befriended japan and each other advance.