U.S. Immigration Basics
Whether you plan to come to the United States for a short visit or a permanent stay, your first step is to apply for a visa.
Many people think they can show up at a U.S. embassy or border post, describe why they’d make a good addition to U.S. society, and be welcomed in. Unfortunately, this is the exact opposite of how the U.S. immigration system works.
Instead, people who want to come to the U.S., whether temporarily or permanently, must determine whether they fit into eligibility categories for either "permanent residence" (a green card) or for a temporary stay ("nonimmigrant visa").
Then they must submit an application -- in fact, often a series of applications -- to one or more of the U.S. agencies responsible for carrying out the immigration laws. These include U.S. Citizenship and Immigration Services (USCIS), which has offices across the United States, and the U.S. Department of State (DOS), which manages consulates and embassies around the world.
What Permanent Residence (a Green Card) Is
If you want to be able to make your permanent home in the United States, you'll need what is called "permanent residence," or a "green card." Green card holders can live and work in the U.S. and travel in and out, with very few restrictions (though they can't vote, and can be deported if they abuse their status).
Family members of U.S. citizens make up the largest number of green cards issued each year. Others are issued to investors and workers who have been petitioned by U.S. employers or have special skills. Still other categories have a humanitarian basis, such as refugee or political asylum status (which can lead to a green card), for people who are fleeing persecution. For more information, see Who Qualifies for a Green Card (Permanent Residence).
What a Temporary (Nonimmigrant) Visa Is
People who want to come to the United States for a limited time need what is called a "nonimmigrant” visa. This lets them participate in specified activities (such as studying, visiting, or working) until their visa runs out. Students and businesspeople make up the largest groups of nonimmigrant visa holders. Nonimmigrant visas are also issued for tourists, exchange visitors, and workers with some kind of specialty that is lacking in the U.S. workforce. For more information, see Applying for a Nonimmigrant (Temporary) Visa.
Exception: Visa Waiver Program
A visa is not necessary for short-term visitors from one of the Visa Waiver Program countries listed at http://travel.state.gov. You can come to the U.S. for up to 90 days for business or pleasure purposes if you're from one of these countries. You will, however, need to present a machine-readable passport. Also, beware: The ease of your entry is balanced by the ease with which you can be kicked out -- you automatically give up many rights and benefits when traveling without a visa.
To enter on a visa waiver, simply present yourself, your passport, and your ticket home to the officers you'll meet upon arrival. If you come by land through Canada or Mexico, you'll also be asked for proof of sufficient funds to pay for your stay.
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