Which country was the first to declare war in the conflict that would become World War I?

Austria-Hungary

Explanation:

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.

Austria-Hungary

Explanation:

Austria-Hungary declared war on Serbia in 1914 after Archduke Franz Ferdinand of Austria and his wife were both killed by a Serbian nationalist.

hope this helps :)

bibliography and citations to credit the sources hope this you if not my deepest of apologize ^w^

the puritans were a group of people who grew discontent in the church of england the common unity strengthened the community.