By Patrick J. Buchanan

Heeding the advice of Gen. David Petraeus, Barack Obama has committed 17,000 more troops to Afghanistan and will keep 50,000 in Iraq after U.S. combat operations end in August 2010.

But are U.S. vital interests more threatened by what happens in Anbar or Helmand than in the war raging along our southern border?

Prediction: After all U.S. troops in Iraq, Afghanistan and Korea have come home, there will be a U.S. army on the Mexican border. For this is where the fate of our republic will be decided, as the fate of Europe will be decided by the millions streaming north from the Maghreb and Middle East, sub-Sahara and South Asia.

Last year, 6,000 Mexicans died in drug-related killings in a war where the tactics are massacre, murder, kidnapping and beheading.

President Felipe Calderon has ordered another 5,000 troops and 1,000 police to the border. Primary target: Ciudad Juarez, across the Rio Grande from El Paso.

Some 2,500 federal troops are already in Juarez, where in 2008 there were 1,600 drug-related murders. Gun battles occur every day. Nationally, 45,000 army troops and police are committed to this war that Mexico is not winning. For, according to the March 3 Washington Times, the Pentagon now estimates the cartels field more than 100,000 foot soldiers.

The chief of police of Juarez just resigned after a cartel threatened to kill an officer even 48 hours if he did not. To prove its seriousness, the cartel murdered four cops, including the chief’s deputy. Last year, 50 police officers in Juarez were murdered.

“The decision I am taking is one of life over death,â€