Question

Passed in May of 1860 the tariff greatly aided northern industrial interests

Answer 1

its the Morril tafft

Answer 2

The Morrill Tariff of 1861 was an increased import tariff in the United States, adopted on March 2, 1861, during the administration of President James Buchanan. The Morrill Tariff raised rates to encourage industry and to foster high wages for industrial workers.