The United States supports the reunification of families but there are immigration rules in place for bringing family members into the country.
If you have the appropriate status, you can apply for a visa for your spouse or other family members under the regulations that apply.
About your status
If you are a U.S. citizen, you can apply for visas for family members. You must be at least 21 years old to file for visas for your parents or siblings. There are no age restrictions to file immigrant visa petitions for other relatives. However, as either a U.S. citizen or lawful permanent resident, you must be at least 18 years old to sign an Affidavit of Support for a spouse or other relative of a U.S. sponsor.
Unlimited Immigrant Visas
There are two categories of family-based immigrant visas. The first is the Immediate Relative Immigrant Visa and these visas are unlimited. They include the spouse of a U.S. citizen, an unmarried child of a U.S. citizen under the age of 21, an orphan for adoption by a U.S. citizen or the parent of a 21-year-old or older U.S. citizen.
Limited Immigrant Visas
The second category is the Family Preference Immigrant Visa, which has an annual limit. This category is for more distant family relations of a U.S. citizen or, in some cases, a lawful permanent resident. Examples, among others: unmarried adult children of U.S. citizens, and unmarried children aged 21 and older of lawful permanent residents.
Since government rules can change, it is wise to rely on the help of an advocate who understands immigration regulations and can assist you in obtaining the visas you need to bring family members into the U.S.