Ok, then:
Russia, China, All the Soviet Pact countries of Europe, Vietnam, North Korea, Cuba, Nicaragua must do the same with all the land they took after their Bolshevik revolution
Armenia Catholics must be given back their land after the Turkish genocide
All the African countries must give back the lands of the Europeans that they stole
The Palestinians must be given all the lands that were taken from them
……..Others can keep adding to the list.