To determine which statement is true about Americans who identify as "two or more races," let's analyze each statement provided:
1. The number of Americans identifying as "two or more races" has remained at approximately 10% since the 1870s.
- This statement seems unlikely because the concept of identifying as "two or more races" was not officially recognized until much later.
2. The number of Americans identifying as "two or more races" has declined from approximately 10% in 1965 to approximately 3% today.
- This statement does not align with historical data trends. The category "two or more races" was not widely recognized or officially recorded in 1965.
3. The number of Americans identifying as "two or more races" has increased from 10% in 1965 to more than 20% today.
- Again, this statement is inconsistent with historical data. The "two or more races" identification was not recorded in official statistics in 1965.
4. The number of Americans identifying as "two or more races" was largely unknown before the census added that category in 2000.
- This statement seems the most accurate. The U.S. Census Bureau officially added the "two or more races" category in the 2000 Census, which provided people the opportunity to identify with more than one race, and thus the data were largely unknown before that year.
Based on these explanations, the true statement is:
"The number of Americans identifying as 'two or more races' was largely unknown before the census added that category in 2000."
