Once the couple marries, the foreign citizen can adjust status to become a lawful permanent resident of the United States (Green Card holder). Although a K-1 visa is legally classified as a nonimmigrant visa, it usually leads to immigration benefits.
The L-1 nonimmigrant visa is clearly one of the simplest paths to legal immigration to the United States. Thanks to dual intent, it allows its holders to seek permanent residence status from day one on American soil.
The H-1B nonimmigrant worker visa has been a legal pathway to permanent residency and U.S. citizenship for decades. Over one million talented aliens have become U.S. citizens since the H-1B visa program was launched in 1990.