Q: In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.
Article: It's likely that everything you learned about America's ancient history is wrong. The new book,1491, completely changes our understanding of the America before the arrival of Columbus in 1492. DID YOU KNOW? When Columbus landed there were probably more people in the Americas than there were in Europe. The peoples of North America had such healthy life-styles that as late as the 19th century they continued to be the tallest people on earth. Facts have shown that the Americas were populated as long as 33,000 years ago. 4,000 years ago Mesoamerican farmers developed corn in a feat of genetic engineering that still isn't completely understood. COMMENTS ON 1491 "In the tradition of Jared Diamond & John MePhee, a totally new view of pre-Columbian America". -Richard Rhodes "Attractively written and really absorbing, Charles C.Mann has produced a book that's part detective story, part epic and part tragedy . He has taken on a vast topic: thousands of years, two huge continents, and cultures." -Charles Matthews,San Jese Mercary News "Powerful and challenging" -Alan Taylor,Washingto post "A pleasure to read as well as a wonderful education" -Howard Zinn
Answer: agriculture
A:
On the whole,1491 is a book mainly about America's _ .