I take it the conditions were removed from your Green Card at some point in the past? Read this.
Quote Quoting Naturalization
Many Permanent Residents of the United States have the ultimate goal of becoming a US citizen. Naturalization is the primary method for most persons not born as US citizens to obtain that status. Under current law naturalization is done by the federal and state courts and in administrative proceedings. Once a permanent resident completes the necessary residence and physical presence requirements (which vary in certain cases), an application for naturalization can be filed with Immigration. This starts a review of the person’s basic eligibility, criminal and security histories, and then leads to testing of the person’s English language abilities, knowledge of the history and form of government of the US, and good moral character. Complete information on naturalization can be obtained on our Naturalization page.

As a naturalized US citizen you have the same rights and privileges as a native born US citizen with one exception. Only a native born US citizen can be president of the United States. As a US citizen you can petition for your parents and siblings to immigrate to the US. Your spouse and children (unmarried and under 21 years of age) qualify for immediate relative classification for immigration purposes, which means they do not have a waiting list to immigrate (like the spouse and children of a Permanent Resident) and can do so as fast as the paperwork can be processed.
You can obtain a guide to naturalization here.