Where does “ワシントンD.C.” come from?

ワシントンD.C. (Japanese) comes from English Washington, D.C. — formally known as the District of Columbia. Abbreviated as D.C. or DC.

Ancestry of “ワシントンD.C.”, step by step

StepLanguageWordMeaning
1EnglishWashington, D.C.formally known as the District of Columbia. Abbreviated as D.C. or DC
Every word from English Washington, D.C.