SAT Subject US History Practice Question 1052: Answer and Explanation
3. The Know-Nothings were
C. supported by slaveholders.
D. supported by Catholics.
E. supported by the Ku Klux Klan.
Correct Answer: B
The Know-Nothings were an anti-immigrant and anti-Catholic group who were also in the American Party. These nativist groups (pro-native-born American) were almost all in the Northeast and destroyed the Whig Party. The Ku Klux Klan, though they might have supported them, didn't exist until 1866.