The United States of America (USA), also known more simply as the United States (US) is a country consisting of 50 states and is the third most populous country in the world with more than 328 million people. The most populous city is New York City. The current president is Joe Biden. The term America wasn’t used much in the US before the 1890s, and rarely used by presidents before Roosevelt. The US was first colonised by migrants from Siberia around 12,000 years ago, who travelled across the Bering land bridge, forming the Clovis culture which appeared in around 11,000 BC. The first Europeans to arrive in the continental US were Spanish conquistadors such as Juan Ponce de León who made an expedition to Florida in 1513, and before that Christopher Columbus landed in Puerto Rico on his 1493 voyage.