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.
Since a green card lasts 10 years, that gives you plenty of time to consider U.S. citizenship. Naturalization is the term used in immigration law when you are going from permanent resident to citizen. In most cases of naturalization by birth, you have little work to do in applying.