What day of the week was May 7, 1915?

The day of the week May 7th, 1915 fell on was a Friday.

World War I: German submarine sinks RMS ''Lusitania'' the killing 1,198 people including 128 Americans. Public reaction to the sinking turns many formerly pro-Germans in the United States against the German Empire Japanese 21 Demands Ultimatum to China (Commemorated as National Day of Humiliation)