Some flags I've been working on for an ATL United States. It's a loose confederation made up of 10 kingdoms and a handful of federal territories, all of which share the same monarch, from the House of Avalon-Veracruz, as their ceremonial head of state. They're all linked to imgur:
Kingdom of Atlanta: Created from the southern territory of the Kingdom of Columbia in the Victorian Compromise of 1845. Includes the OTL CSA (except for Texas), Maryland, and Kentucky.
Dominion of California: Declared independence from the Spanish Empire during the Spanish-American War, in 1865. Includes OTL California, northern NM/AZ, Nevada, and Utah.
Kingdom of Canada: Declared independence from Britain alongside Columbia in 1767. Includes OTL Quebec, Newfoundland, Labrador, and the Maritimes.
Dominion of Cascadia: Gained independence from Britain in 1909, during the Great War. Includes OTL British Columbia and Alberta.
Kingdom of Columbia: Declared independence from Great Britain alongside Canada in 1767. Includes the rest of the OTL US, Ontario, Manitoba, and Saskatchewan.
Commonwealth of Cuba: "Voluntarily" offered the crown to King Alexander II at the end of the Spanish-American War.
Duchy of Guatemala: Originally a part of Mexico, it became a separate federal entity in 1906. Includes OTL Guatemala, Honduras, El Salvador, Chiapas, and northern Nicaragua.
Empire of Mexico: Gained independence from Spain during the Spanish-American War, became joined to the other states by the marriage of Empress Maria I to King Alexander II in 1876.
Duchy of Nicaragua: Like Guatemala, it was originally part of Mexico, although it gained its independence in 1884. The Nicaraguan flag, with its distinctive bat emblem, was made to honor Roberto Wayne, "The Batman", a multimillionaire-turned freedom fighter who was instrumental in the defeat of the Spanish in Central America during the Spanish-American War. Includes OTL Nicaragua, Panama, and Costa Rica.
Dominion of Texas: Declared its independence in 1864. The Texan Revolution, and the House of Avalon's support of it, was one of the main causes of the Spanish-American War. Includes OTL Texas, eastern New Mexico, and western Louisiana.
The Crown Territories: The 13 territories under the direct rule of the federal government. Includes the capital, Avalon, as well as number of islands around the world.
The House of Avalon-Veracruz: The American Royal Family. Created by the union of the House of Avalon and the House of Veracruz in 1876. The House of Avalon was founded by Frederick I "the Great" of Avalon. Frederick was formerly known as Prince Frederick von Hohenzollern of Prussia, although he gave up his claim to the Prussian throne following his escape to America in 1730. The House of Veracruz was founded by Emperor Carlos I of Veracruz, formerly Duke Carlos de Borbón.
Edit: The blue double-headed eagle was created by Regicollis from Deviantart.com, and I used that as the base for the white version. The same thing goes for the royal coat of arms. For that, I redid the shield and removed a couple stars, but otherwise left the original design as it was. I can't believe I almost forgot to give credit for that.