WATCH: Former CIA Director John Brennan testifies amid new Russia revelations

Amazon to build two fulfillment centers in Chicago area

Amazon officials said the company has shipped more than one billion items during the 2016 holiday season — more than five times its sales in 2015 between November 1st and December 19th.

Of those one billion items, the Echo Dot was the most popular — selling nine times as many as the number sold in 2015.

There were plenty of last-minute shoppers — with December 23rd the most popular day for Prime Now deliveries.