If you are engaged with an American citizen it is possible to enter the United States with a K-1 fiance(e) visa.
In order to qualify for a fiance(e) visa, you must meet the following main requirements:
As soon as the K-1 visa is issued and the fiance(e) arrives in the United States the marriage must take place within 90 days of the entry. After the marriage a petition for permanent residency needs to be filed with the USCIS.
VisaVersa has extensive experience with the preparation and filing of K-1 visa petitions.