On 7 September 1822, at the banks of the Ipiranga Brook (near present-day São Paulo), Prince Regent Dom Pedro de Alcântara made a decision that severed three centuries of Portuguese rule.
Riding with his guard, Pedro received dispatches confirming the Cortes' decree stripping his powers. He drew his sword, tore the Portuguese blue-white cockade from his hat, and shouted:
"Independência ou Morte!" — "Independence or Death!"
His guard echoed: "Independência!" The Brazilian Empire was declared; Pedro became Dom Pedro I, Constitutional Emperor.
Not all accepted immediately. Three northern provinces resisted:
Brazilian forces (led by French mercenary general Pierre Labatut, then Lord Cochrane at sea) secured victory. Portugal recognized independence August 29, 1825 (Treaty of Rio de Janeiro), mediated by Britain — Brazil paid £2M indemnity + assumed Portuguese debt.
The Ipiranga moment — more theatrical than military — gave Brazil a founding myth: a prince choosing his adopted land over his birthright. The sword, the brook, the shout: symbols that still anchor Brazilian identity.