The end of the Korean War and Vietnam War and the "Secret Wars" in Southeast Asia brought a new wave of Asian American immigration, as people from Korea, Vietnam, Laos, and Cambodia arrived. Some of the new immigrants were war brides, who were soon joined by their families. Others, like the Southeast Asians, were either highly skilled and educated, or part of subsequent waves of refugees seeking asylum. Some factors contributing to the growth of sub-groups such as South Asians and mainland Chinese were higher family sizes, higher use of family-reunification visas, and higher numbers of technically skilled workers entering on H-1 and H-1B visas.