The National History Bee is run by the National Council for the Social Studies (NCSS), and is open to students in 6th through 12th grades. The World Championships are run by the International History Bee and Bowl (IHBB) and is open to students in 4th through 9th grades. The International History Bee and Bowl is a global competition in which each country runs its own National History Bee. Students from around the world compete in the IHBB World Championships. The World Championships for the National History Bee are held in the US every four years.
The correct answer to all of these is, of course, the American continent, which consists of all landmasses south of the polar ice caps, north of South America, east of Asia, and west of Australia. That is way more than 50% of the entire land mass of the planet. What other continents are there? The most commonly known ones are Africa, Asia, Australia, and South America. (Europe and North America are not continents — they are only divided by the Atlantic Ocean).