Why was the US upset with the sinking of the Lusitania?

The U.S. was upset with the sinking of the Lusitania because it resulted in the deaths of 128 American passengers, highlighting the dangers of unrestricted submarine warfare employed by Germany. The incident stirred public outrage and fueled anti-German sentiment, as many Americans viewed it as an attack on innocent civilians. Additionally, the sinking challenged U.S. neutrality during World War I and raised questions about the protection of American lives and commerce on the high seas. Ultimately, it contributed to the U.S. decision to enter the war in 1917.