Tripoli.
Tripoli declared war on the United States after the US refused to pay a bribe.
tripoli
The Barbary Pirates.
Britain told Germany to remove their troops from Poland. Germany refused and Britain declared war on them
Mobilization
ZERO
Henry David Thoreau.
He practiced civil disobedience by not paying taxes to protest the war.
British Parliament
No, that was more like the Mexican War. The American Civil War was a rebellion of eleven states that declared themselves to be a separate nation, which Congress refused to recognise.
The final demand is called an "Ultimatum" which is Latin for "the last one", that is a demand. If the ultimatum is refused or ignored a state of war is declared and war commences. This is the correct and legal procedure to declare war.
Russia was bound by treaty with Serbia, Montenegro declared war on Austria-Hungary. Germany declared war on Russia. France bound by treaty with Russia declared war on Germany, Great Britain declared war on Germany after Germany refused to respect the neutrality and sovereignty of Belgium. United states tried to stay neutral but were to threatned by Germany's submarine attacks on Trade vessels to Germany's enemies. Japan had a military agreement with Britan, so declared war on Germany.