You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Nonprofit_organization

Context:
Individual states and localities offer nonprofits exemptions from other taxes such as sales tax or property tax. Federal tax-exempt status does not guarantee exemption from state and local taxes, and vice versa. These exemptions generally have separate applications and their requirements may differ from the IRS requirements. Furthermore, even a tax exempt organization may be required to file annual financial reports (IRS Form 990) at the state and federal level. A tax exempt organization's 990 forms are required to be made available for public scrutiny. An example of nonprofit organization in the US is Project Vote Smart.

Question:
What is one example of an NPO in the United States?

Project Vote Smart