original question: How many written works are there about [United States of America]?
answer: 9857
answer type: Written Work.
auxiliary information: The United States of America, commonly referred to as the United States or America, is a federal republic consisting of 50 states and a federal district. The 48 contiguous states and Washington, D.C., are in central North America between Canada and Mexico. The state of Alaska is located in the northwestern part of North America and the state of Hawaii is an archipelago in the mid-Pacific. The United States also has five populated and numerous unpopulated territories in the Pacific and the Caribbean. At 3.8 million square miles and with over 320 million people, the country is the world's fourth-largest by total area and the third most populous. It is one of the world's most ethnically diverse and multicultural nations, the product of large-scale immigration from many countries. The geography and climate of the United States are also extremely diverse, and the country is home to a wide variety of wildlife. Paleo-Indians migrated from Eurasia to what is now the U.S. mainland at least 15,000 years ago, with European colonization beginning in the 16th century. The United States emerged from 13 British colonies located along the East Coast.
How many pieces of  written work have been created on the topic of the [United States of America]?