Misc: what is the capital of the united states?

Questions

President Andrew Johnson formally declared the Civil War over.?

Salvatore Quasimodo, Italian poet, critic, translator (Nobel 1959), born.?

German forces occupied Brussels, Belgium, during World War I.?

Britain opened its offensive on the Western front during WW I.?

US's first commercial radio, 8MK (later WWJ), Detroit began daily broadcasting?