Is hepatitis b prevalent in the us?

Yes. While not as prevalent as asia where the incidence is a high as 25 percent, there are probably over a million and half residents of the United States with hepatitis b. Most commonly it is seen in patients with asian ancestry and in alaska.
Yes. It is prevalent in certain sub-populations such as certain immigrant groups and alaskan natives. There are over 1.25 million hepatitis b carriers in the United States and it is much more common in foreign born immigrants to the us who come from countries with a high prevalence.