| GREATWAR | US entered it in 1917 (5,3) |
| PEARLHARBOR | The US entered WWII in 1941 after a surprise attack on this Hawaiian naval base (5,6) |
| WWI | The U.S. joined it in 1917 |
| HAWAII | America entered WWII after the Japanese destroyed much of her Pacific Fleet at Pearl Harbor in this |
| NASA | In 1958 USA entered the space race with the establishment of this agency |
| WWII | The U.S. entered it in 1941 |
| WARI | World ___ _ (Canada entered it in 1914) |
| SPACEAGE | With opening of sputnik period, one's entered it (5,3) |
| SCARFACE | Nickname of US gangster Al Capone, deriving from knife wounds received in a barfight in 1917 (8) |
| CHEQUERS | Estate in the Chilterns bequeathed to the nation by Sir Arthur Lee in 1917, used as the country hous |
| MATAHARI | What was the nickname of the Dutch dancer and secret agent executed in France in 1917? (4,4) |
| LESDARCY | Maitland boxer who died in Memphis in 1917, aged 21 (3,5) |
| IZVESTIA | Russian newspaper first published in 1917 (8) |
| VERALYNN | British singer born in 1917 known as the Forces' Sweetheart |
| MOONPIES | Treats inspired by a coal miner in 1917 |
| BOYSTOWN | Orphanage founded in 1917 |
| ZEPPELIN | Ferdinand von -, German airship pioneer who died in 1917 (8) |
| HEAVENKNOWS | Who can tell if the Recording Angel has entered it! (6,5) |
| DISINTERMENT | While up at uni, having entered it ends somehow being brought to light |
| TIGERRAG | Jazz standard first recorded by the Original Dixieland Jass Band in 1917 |
