illegal immigration reason

基本解释

A history of conflict and a present bedevilled by recession, drug-trafficking and illegal immigration should be reason enough to make relations across the Rio Grande decidedly fraught.
由於歷史的沖突和目前讓人睏擾的經濟衰退，販毒和非法移民有足夠的理由對跨越格蘭德河的關系無疑變得更加讓人擔憂。

One reason for the speech was the state of Arizona's recent passage of its own law against illegal immigration.

The lack of a legal visa category for the jobs most illegal immigrants fill is a core reason for illegal immigration.
FORBES: Too Few Work Visas in New Immigration Bill
Today, there are few legal avenues for lesser-skilled foreign workers, which is a prime reason for illegal immigration.
FORBES: Colbert Hits the Mark in Hill Testimony
One reason appears to be reduced immigration, both legal and illegal, because of diminished job opportunities and more effective border enforcement.
ECONOMIST: Troubling trends behind the falling unemployment rate