Family Based Immigration. A foreing citizen seeking to live permanently in the United States requires an immigrant visa (IV). See the link below for more information.
https://travel.state.gov/content/travel/en/us-visas/immigrate/family-immigration.html

Family of U.S. Citizens. The U.S. Citizenship and Immigration Services (USCIS) provides an explanation of how a U.S. citizen may petition for certain family members to receive either a Green Card, a fiancee visa, or a K-3/K-4 visa based on the relationship.
https://www.uscis.gov/family/family-of-us-citizens

US Family Reunification - UNHCR
https://www.unhcr.org/en-us/us-family-reunification.html