Compromise Enables Maine and Missouri To Enter Union (1820) California Admitted to Union as Free State (1850) Kansas-Nebraska...

Compromise Enables Maine and Missouri To Enter Union" (1820)

"California Admitted to Union as Free State" (1850)

"Kansas-Nebraska Act Sets Up Popular Sovereignty" (1854)

Which issue is reflected in these headlines?

1. enactment of protective tariffs

2. extension of slavery

3. voting rights for minorities

4. universal public education