I think its water and iron
Easier technological innovations
Slavery was released between the 40 years.
It took place during the 1860s
Answer:
In the national popular vote, Polk beat Clay by fewer than 40,000 votes, a margin of 1.4%. James G. Birney of the anti-slavery Liberty Party won 2.3% of the vote. As President, Polk completed American annexation of Texas, which was the proximate cause of the Mexican–American War.
Explanation: