Lusitania was an important event in World War I. The death of so many innocent civilians at the hands of the Germans galvanized American support for entering the war, which eventually turned the tide in favor of the Allies. The Lusitania was a British luxury cruise ship.
A unitary system of government is a monarchy. Which means that the country is ruled by one person or a group of people. An example of a unitary system is a country that is run by a royal family, that consists of kings and queens.
A federal system is a system is a system of government that is run but not ruled by a government that has many different political parties and many different people. The United States is an example of a federal system.
Armenians--in Turkey during World War I at the hands of the Ottoman Empire
The Christian Armenians were targeted by the Islamic government during World War I. Those that were not systematically killed left the country is mass migrations.