Vietnamese immigration to the United States is a relatively recent occurrence when considered within the scope of Asian immigration. Vietnamese immigration to the United States occurred in the latter half of the 20th century and continues steadily today. A vast majority of Vietnamese Americans arrived as refugees, thus their departure from Vietnam was marked with political turbulence, and their arrival in America was highly scrutinized in the news media and academic scholarship. Before 1975, Vietnamese living in the United States were students, professionals, and war brides. In the 1950s, their numbers were in the low hundreds. However, in the 1960s until 1974, the population of Vietnamese Americans swelled to about 15,000. It was during those war years that the small population of Vietnamese Americans participated in the antiwar movement in American colleges and universities. This group remains an understudied population in Vietnamese American history.