The islands were granted extensive autonomy by the Parliament of Finland in the Act on the Autonomy of Åland of 1920, which was later replaced by new legislation by the same name in 1951 and 1991.
Saartele andis ulatusliku autonoomia Soome parlament 1920. aastal vastu võetud Ahvenamaa autonoomia seadusega, mis hiljem asendati uute samanimeliste seadustega aastatel 1951 ja 1991.