The Holy Empire of Amestris-Britannia is a colossal, efficient nation, ruled by Aoki vi Britannia - 宇宙の錬金術師 with an even hand, and renowned for its infamous sell-swords, enslaved workforce, and punitive income tax rates. The hard-working, democratic population of 5.76 billion Amestris-Britannians have some civil rights, but not too many, enjoy the freedom to spend their money however they like, to a point, and take part in free and open elections, although not too often.

The large government prioritizes Education, with Healthcare, Industry, and Environment also on the agenda. It meets to discuss matters of state in the capital city of Amestris. Citizens pay a flat income tax of 65.3%.

The all-consuming Amestris-Britannian economy, worth 465 trillion Sekkis a year, is fairly diversified and led by the Information Technology industry, with significant contributions from Book Publishing, Basket Weaving, and Uranium Mining. State-owned companies are common. Average income is 80,826 Sekkis, but there is a significant disparity between incomes, with the richest 10% of citizens earning 289,676 per year while the poor average 16,174, a ratio of 17.9 to 1.

The government has declined to declare any particular religion as its 'official' one, families waiting for delayed pipe installations hope daily for rain, police officers often head to work wearing onesies and fluffy pink bunny-slippers, and snap elections are called over every minor impasse. Crime is totally unknown, thanks to a capable police force and progressive social policies in education and welfare. Amestris-Britannia's national animal is the Rat, which frolics freely in the nation's many lush forests, and its national religion is Freedom of worship.

Amestris-Britannia is ranked 59,493^rd in the world and 3,015^th in The North Pacific for Lowest Crime Rates, with 67.66 Law-abiding Acts Per Hour.