Answer:
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.
Explanation:
To return Jerusalem and the Holy Land to Christian control. The crusades failed because they were not able to retrieve the Holy Land.
I believe it is B lmk if in wrong
Lm aooo i think we all kno