Countries change flags for many reasons — revolutions, independence, new governments, constitutional changes and attempts to create a new national identity.
Why change a flag?
A national flag is more than a piece of coloured cloth. It can represent a government, a political system, a historical tradition or an idea of national identity. When those things change, a country may decide that its flag should change too.
Revolution and political change
Revolutions are one of the clearest reasons for a new flag. A new government may want to remove symbols associated with the old regime and replace them with colours or emblems representing a new political direction.
Independence and decolonisation
Newly independent countries have often adopted new flags to distinguish themselves from a former colonial power. The new design can celebrate local history, culture, geography or independence.
Restoring an older flag
Sometimes a country does the opposite and brings back an older design. This can happen when a later political period is rejected and an earlier national tradition is revived.
Flags can change without a revolution
A flag may also be altered for less dramatic reasons. A constitution may specify a new design, a coat of arms may be simplified, or a country may adjust proportions, colours or symbols.
A flag can become part of political debate
Because flags are powerful symbols, changing one can be controversial. Supporters may see a new design as a fresh start, while opponents may see the change as erasing history.