It was not until after the Korean War in 1953 that any systematic migration of Koreans to the United States re-commenced. The post Korean war period heralded the arrival of very small numbers of Korean students and professionals, and a larger number predominantly comprised of servicemen's wives and adoptees. The last two groups, servicemen's wives and adoptees, were admitted to the United States under special considerations, and it is difficult to get an accurate count on the numbers who came under these auspices. Additionally, given the dispersal of these groups throughout the country and their statuses as dependents of Americans, they did not make an impact on the development of the Korean American community, and they have remained relatively invisible within Korean American community. Their numbers, however, are not insignificant. It is estimated that one in four Korean immigrants in the United States can trace their immigration to the efforts of the wife of a serviceman. And at this time, it is estimated that about 150,000 Korean children were adopted to American families.