As your "other country" category demonstrates, Brazil is not the only Latin American country involved in WWI just the only South American country. Traditionally, A-H and Germany were referred to as Central Powers as they were located in central Europe, thus the British Empire is not a Central Power. And most Commonwealth countries (Canada, Australia,etc) are really annoyed when their contributions are lumped in with the Empire. Belgium offered confused and weak resistance not very "stiff".
More abbreviations and alternate choices are needed, especially for Austria-Hungary. I tried "Austria," "Hungary," "Austro-Hungarian Empire," etc. and couldn't get it.
Liberia never officially fought in the war, and neither did china as they were recovering from their recent civil war. You forgot Canada and Australia, who both sent formable military assistance.