I think D. but I’m not for sure
The answer is:
d. Congressional staff
Hope i helped :)
On July 28, 1914, one month to the day after Archduke Franz Ferdinand of Austria and his wife were killed by a Serbian nationalist in Sarajevo, Austria-Hungary declares war on Serbia, effectively beginning the First World War.
Answer:
A I think?
Explanation:
I don't really know the context of the cause and effect I can't say for sure, sorry but I hope I helped
The american civil war started 1861 and ended 1865