An amendment to the US Constitution must be ratified by what fraction of all the states?

More Questions:

What fruit's name comes from the Nahuatl word for "testicle"?

When did seat belts become a mandatory equipment on US cars?

Which series of novels refers to its main character as "The Last Gunslinger"?

Which quarter of New Orleans is famous for its restaurants and jazz clubs?

Thursday Island is located in the Torres Strait off the coast of what country?

Which US state is nicknamed the "Ocean State"?

In which US state would you find Devils Tower?

What plant when ingested (in small quantities) can make the oil of your skin poisonous?

The angel shark is commonly referred to by what other name?

What term is applied to animals or plants that are not nocturnal?

What country gave the Statue of Liberty to the US?

Who did Prince Charles wed in a "wedding fit for a prince" in 2005?

Which British Prime Minister died in 1965?

What name is given to animals which only eat plants?

In Greek mythology, who are Hestia's six siblings?