Under which U.S. government agency are the National Visa Center and U.S. Embassies and consulates?

What kind of intention does someone applying for an NIV have to prove to either (or both) USCIS or the U.S. Embassy?

What have you learned so far in the class about immigration law that surprised you? Has anything covered thus far challenged or changed your views about immigrants or immigration in the United States? If so, how so? If not, why not?