If a Romanian resident in Germany is planning to stay in the US for more than 90 days, or if they are visiting for purposes other than tourism or business (such as studying or working), they will need to apply for a visa at a US embassy or consulate. The type of visa they need will depend on the specific purpose of their visit.
It is important for Romanian residents in Germany to carefully plan their trip to the US and to ensure that they have the necessary travel documents before departure. They should also be aware of any other requirements or restrictions that may apply to their visit, such as health requirements or customs regulations.