Flour is the primary ingredient of any bread recipe. It is the bread that we see. Flour contains gluten, a protein that provides for the elasticity, and the basic structure of bread. As the mixture is heated, the starch in bread sets, and adds to the structure.
If you are a U.S. permanent or conditional resident -- that is, someone with a green card -- the basic rule is that you cannot apply for U.S. citizenship (or apply to naturalize) until you have lived in the United States as a lawful permanent resident for at least five years.
A person must first become a Green Card holder, in order to apply for US citizenship and must be above age 18. Similarly, he must have held his Green Card for at least five years and he must file his naturalization application in the American state where he has been living for the past three months.