How to apply for US citizenship?

I am a foreign college student in the US currently. I used to live in the US and I used to have a green card before my parents decided to move back to our home country, then I lost it. My brother was born in the US, so he automatically has citizenship, as well as my mother still having a green card.





I would like to have US citizenship/passport but don't know where to start from.





Any advice?





thanksHow to apply for US citizenship?
After having lived in the United States as a permanent resident (green card holder) for a certain years, the next step is to apply for a citizenship. The process of an immigrant becoming a US citizen is termed 'naturalization'. It is the biggest gift the USCIS (US citizenship and immigration services) can grant.





Following guidlines provided to proceed further step by step





Step 1:


Download the form N400 from the USCIS website to ensure you have the latest form. Also download the N400 form instructions from the USCIS website. Both these can be found at http://www.uscis.gov/naturalization





Step 2: Read the instructions and then fill out the form and be as accurate as you can.





Step 3: Get your passport style photograph. Usually the application requires 2 (check the latest count before you get it). Write your A-number on it.





Step 4: Prepare necessary documents and get a cashier's check payable to Department of Homeland Security or U.S. Citizenship and Immigration Services. Write your A number on the check.





Step 5: Identify where to send your application, by reading form M-476 that can be found at http://www.uscis.gov/natzguide. It identifies locations based on your state.How to apply for US citizenship?
Your brother or your mother can petition for you but there will be a long wait for a visa. It would be somewhat shorter if your mother petitioned. Should she become a citizen and if you remain unmarried,


the wait would be much shorter. The petition form I-130 and instructions


can be found at uscis.gov.