Isabella I & Ferdinand II unified the kingdoms of Castile and Aragon into Spain.
War of the Castilian Succession: The war began.
War of the Castilian Succession: The war ended.
Italian War: Ferdinand allied with French King Louis XII of France
Anglo–Spanish War (1585): The war began.
Thirty Years' War: The war began
The Spanish Constitution of 1812 was issued.
The First Spanish Republic was established.
Spanish-American War: The war began.
World War I: The war began. Spain remained neutral.
The Spanish Constitution of 1978 was issued.
Spain joined the European Union