Tibet

Palestine and Tibet should both be on such a list.

I am so glad to see Palestine on many people's lists. that gives me hope.

Lebanon has been a puppet state of Syria for years.

This is a long list, but should be the very first if there were to be a series. Most of these nations listed do have flags.

Anishinaabewaki ("Anishinaabe Land")[Ojibwe]Anishinaabe Country

Apsáalooke Country, Crow Country

Kakouagoga Country

Benteh ("Among the Lakes) Tanaina Country

Chahta Yakni ("Choctaw Land") [Choctaw]

Chikasha Yakni "Chickasaw Land" [Chickasaw]

Yokot'an Country, Chontal Country

Chicora Country

Teenek Country, Huaxtec Country

Diné Bikéyah ("Land of the People") [Navajo]

Tuscarora Country

Eeyou Istchee, Iynu Asci ("Land of the People") Northern East Crees

Gawi Wachi ("The Place of Nurturing") Tarahumara Country

Haida Gwaii [Haida]

Hopitutskwa ("Hopi Land") [Hopi]

Inuit Nunaat ("Land of the Inuit") Inuit Country

Kanién:ke,("Land of Flint") Mohawk Country

Karúk Veezívzaaneen ("Karuk (Upriver) Country")

Atikamekw Country

Lakhota Makhoche ("Lakota (Allies) Country") [Lakota]
Lakota Country

Lingít Aaní ("Land of the Tlingit") Tlingit Country

Lenapehoking ("In the People's Land")Lenape Country

(Mahiganek ("At the Mahicans"))Mahican Country

Manahatta ("Hilly Island" or "The Small Island")Manates Country

Mánu: Yį Įsuwą ("Land of the River (Esaw) People")Catawba Country

Wawenoc Country

Mēxihco [Nahuatl]Mexica Country, Aztec Country

Massachusett Country

Myaamionki ("Place of the Myaamia (Miami)"[Miami-Illinois]Miami Country

Na:tinixw ("Where the Trails Return" = Hupa Valley)Hupa Country

Newe Segobia ("The People's Earth Mother")Western Shoshone Country

Niitsitpiis-stahkoii, Blackfoot Country

Innu Country, Montagnais Country

Muhtaniyewihkuk ("In Montagnais Territory")

No-wa-mu ("Mother Earth")Jemez Country

Nʉmʉnʉʉ Sookobitʉ ("Comanche Earth")Comanchería, Comanche Country

Nunatsiavut ("Our Beautiful Land") Labrador Inuit Country

Seneca Country

Nuniwarmiut Country

Nutshimiu-aschiiy ("Naskapi land")Naskapi Country

O-nunˊdä-ga-o-noˊ-ga, Onondaga Country

Onyota’a:ka’, Onʌyoteʔaˑkaˑ' ("People of the Standing Stone) Oneida Country

O'odham Jeweḍ ("Land(s) of the People) O'odham Country

Algonquin Country

Paskwāwiýinīnāhk ("In the Plains Cree Country")

Pokanoket ("Land of the Bitter Water Bays and Coves")Wampanoag Country

S’atsoyaha ("Land of the Sun-fire-people")Yuchi Country

Shawandasse Tula ("Southwind Earth")Shawnee Country

Shiwinnaqin [51] [Zuni] Zuni Country

Squamish Country

Upper Chehalis Country

Tatl'ahwt'aenn Nenn' ("Headwaters People's Country") Upper Ahtna Country

Totonac Country

Powhatan Country

Tséstho'e, Zesthoe (" Cheyenne Land ") Cheyenne Country

Tümpisakkatün ("At the Rock Ochre"; Death Valley and vicinity) Timbisha Country, Panamint Country

Wa She Shu E Deh ("Washo Land") Washo Country

Waayaahtanonki ("Place of the Waayaahtanwa (Wea)")Wea Country

Wabanaki Country, Abenaki-Maliseet-Penobscot-Passamaquoddy-Mi'kmaq Country

Wazidja ("The Grand Pinery") Hotcâk Country, Winnebago Country

Wendake [Wyandot] Wendat Country, Wyandot Country

Huronia, Huron Country

Winnemem Country

Wintʰu· Po·m ("Land of the People (Wintu)")Wintu Country

(Yurúk Veezívzaaneen ("Yurok (Downriver) Country") [Karuk])
Yurok Country

You make a great point about flags - maybe there are other ways that people would like to be recognized/honored. I've never been a fan of flags anyhow.

palestine has been under occupation for more than 70 years!!yes..70 years..
it has been almost a centry and peace is not anywhere soon. palestinians are treated exactly the same way the native americans were treated 500 years ago.Both were kicked out of their homes. Both were looked at as terrorists or beasts. However, 500 years later, the world knows how much the native americans had suffered. I hope it will not take another 500 years to realized how much the palestinians are suffering!!

In the sense of having been recently conquered and occupied by a foreign army, these come to mind:
Afghanistan
Chechnya
Granada
Iraq
Kuwait
Malvinas Islands
Palestine
Panama
Tibet

Palestine, Kurdistan, Chechenya, Tibet, all the native nations of the Americas, Aboriginal Australia, etc. There are more meaningful things that the US could do than to make a stamp, but symbolically, those peoples would probably appreciate the recognition.

Taking a somewhat longer view, pick any country in North America, South America, or the Caribbean Sea.

CYPRUS (Invated by Turkey since 1973 and forced the split of the island in half by the creation of the creation of the pseudo-republic of Northen Cyprus)
Tibet (no comment!!)

I would put the United States itself on the stamp, since our government has been overrun by a radical junta that seems hell bent on destroying our country from the inside out with its reckless policies both domestic and abroad.

Definitely Cyprus... it has been overrun by everyone from the Turkish to the Phenicians to the British... just to name a few.

The Iroquois Nation, Mayan, Incan, and Aztec Empires. Too often we forget about all the people that inhabited America before Europeans "civilized" it.