The Borderlands of the Southwest

The borderlands of the Southwest:

A) had only rarely been a source of tension for Americans since the passage of the Hart-Cellar Act.
B) emerged as an area of renewed anxiety for some Americans in the wake of the September 11 attacks.
C) only infrequently enjoyed close cultural and community connections to Mexico.
D) seemed less of a national security threat than the borderlands of the Pacific Northwest.