Country from which the United States imports the most meat as of 2004:

Canada
The US imported about 779,993 tons of meat from Canada in 2004, compared to only 1,897 from China, the world's largest producer.
Source: USDA, 1/1/2006
Website: www.nass.usda.gov/Publications/Ag_Statistics/agr06/CHAP07.PDF

 
   
  World's largest meat exporter in 2005:

Brazil
Brazil exported about 2.2 million metric tons of meat in 2005.
Source: USDA, 1/1/2006
Website: www.nass.usda.gov/Publications/Ag_Statistics/agr06/CHAP07.PDF

 
   
  Amount of beef the average American ate per day in 2000-2002 (in calories):

118

Source: The Los Angeles Times, 3/11/2006

 
   
  Amount of beef per capita eaten annually by the average Argentinian:

143 lbs.
The New York Times (4/3/06) comes in a little higher, saying that "the average Argentinian eats nearly 150 pounds of beef" annually, twice as much the average American.
Source: Los Angeles Times, 3/11/2006