whatevent led the United States protest German actions in 1915
http://en.wikipedia.org/wiki/RMS_Lusitania
The event that led the United States to protest German actions in 1915 was the sinking of the British ocean liner, RMS Lusitania, by a German U-boat. This incident played a significant role in shaping America's stance towards World War I and eventually led to its involvement in the war.
To find this answer, you can follow these steps:
1. Start by researching the involvement of the United States in World War I.
2. Look for significant events or incidents that spurred American entry into the war.
3. Narrow down your search to incidents involving Germany in 1915.
4. Focus on maritime events during that period.
5. You will come across the sinking of the RMS Lusitania as a pivotal event that initiated protests by the United States against German actions.
By following these steps, you can gather information about the specific event that triggered the United States' protest against Germany in 1915.