Why didn't Kate Winslet win the Oscar for Best Actress in Titanic?

1997 best actress helen hunt (perfect) in the 70th Oscar.

But the most brilliant thing is Titanic.

* * * Won 1 1 Oscars, respectively:

Best film Titanic Paramount, Twentieth Century Fox

Best Director James Cameron (Titanic)

Best Photography "Titanic"

Best Art Director Peter Lamont (Titanic)

Best sound effects Tom Johnson, etc. (Titanic)

Best editing Harris et al. (Titanic)

James horner Best Music Score (Titanic)

My heart is eternal, the best original song Titanic.

Best Visual Effect Robert Lagoto (Titanic)

Best dressed Deborah (Titanic)

Best Sound Editing Tom Bellfort (Titanic)