Final answer:
Based on Census data and legislative representation statistics, white Americans are most likely to have a proportional relationship between their population share and representation in the US House, in comparison to other groups such as African Americans and Latinos.
Step-by-step explanation:
When considering the proportional relationship between a group's share of the US population and its share of representatives in the US House, we can use 2019 census estimates to examine the representation levels. According to the data, white Americans comprise approximately 76.3 percent of the U.S. adult population and have consistently been the dominant group in political representation. Therefore, they are most likely to have a proportional or closer to proportional representation when compared to other racial or ethnic groups.
Data from Emory University and the U.S. Census Bureau indicate that both African Americans and Latinos are underrepresented relative to their populations. In particular, Latinos made up 4.4 percent of state legislators despite accounting for 18.5 percent of the population, showing a significant disproportion. Meanwhile, African Americans made up 9.3 percent of state legislators, compared to their 13.4 percent share of the population. This data suggests that white Americans most likely have a more proportional relationship between population share and legislative representation, meeting the student's query more accurately than other groups listed.