Mexico -- #1 for a change!

... it used to be Canada...

The top sources of US crude oil imports for March were Mexico (1.697 million barrels per day), Canada (1.693 million barrels per day), Saudi Arabia (1.313 million barrels per day), Venezuela (1.183 million barrels per day), and Nigeria (1.114 million barrels per day). U.S. Department of Energy: Crude Oil and Total Petroleum Imports