The borderlands of the Southwesta.had only rarely been a source of tension for Americans since the passage of the Hart-Celler 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.e.were not largely affected by the September 11 attacks because of their location.