USA Ethnicity Options

Summary: In the personal details > Demographic Info, the options available for Ethnicity (Country United States) don't have the option "Two or more races" available for selection and there is no rule to avoid the user to select more than one race option. Based on USA regulation, only one option can be selected between these options: "White", "Black or African American", "Hispanic or Latino", "Asian", "American Indian or Alaska Native", "Native Hawaiian or other Pacific Islander", "Two or more races".

Content (required): The system allows the user to select how many options the person wants. Details in the screenshot from the system attached. How other USA clients proceed? Is there any option to prevent the user to choose more than one option? Is it possible to include the option "Two or more races" in the list?