Which issue led directly to the breakdown of national political parties? A. nullification B. protective tariff C. secession D. slavery

B. protective tariffs

Explanation:

The protective tariffs are tariffs set to imports in order to maje them more expensive, this in theory will make them less appealing to the consumers since the national products are cheaper and more affordable and this creates a revenue for the government and protects the local economy, Lincoln had a protectionist view of economy and his opposers had a free trade view of economy, this lead to the first division for political parties.

B. protective tariff