Where does “メキシコ合衆国” come from?

メキシコ合衆国 (Japanese) comes from Japanese メキシコ, from English Mexico, from Spanish México, from Classical Nahuatl Mēxihco — Mexico.

Ancestry of “メキシコ合衆国”, step by step

メキシコ合衆国 traces back through two separate lines of ancestry.

via Japanese メキシコ

StepLanguageWordMeaning
1JapaneseメキシコMexico
2EnglishMexiconow submerged under Lake Tawakoni
3SpanishMéxicoMexico
4Classical NahuatlMēxihcoMexico

via Japanese 合衆国

StepLanguageWordMeaning
1Japanese合衆国federal state; United States
2EnglishUnited StatesThe collection of individual states of the United States of America
Every word from Classical Nahuatl MēxihcoEvery word from Spanish MéxicoEvery word from English Mexico