Katniss's father once said that to her. Which basically means this:
Katniss is also a type of edible flower. Katniss Everdeen was named after the edible root.
When her father said this, he meant that as long as she can find her flower (which is katniss) she won't go hungry as the flower katniss is edible.
Katniss Everdeen - District 12 resident
katniss - Edible flower
She is named after a root which you can eat called katniss root. So he meant that if she could find katniss root she would never starve.
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Gale. He'd never changed.
Effie Trinket's birthday is never mentioned in The Hunger Games.
Primrose Everdeen was killed in a bombing, but it never said who specifically was responsible.
In the first book Katniss' Father tells her "You can survive as long as you can find your self." He was talking about the plant but it has a deeper meaning. It is saying once Katniss found herself (The Mockingjay) she defeated the Capitol, thus in a way "surviving."
No other countries/continents/civilizations were mentioned in the Hunger Games trilogy. The other places might still exist, but are not thought to be.