During this period, he signed several laws that advanced the rights of and opportunities for black residents, as well as guaranteeing jury trials for fugitive slaves in the state.
Several factors, including attitudes to his vocal opposition to slavery, his support for immigrants and Catholics, and his association with editor and political boss Thurlow Weed, worked against him, and Abraham Lincoln secured the presidential nomination.
As it was too late for him to graduate with his class, he studied law at an attorney's office in Goshen before returning to Union College, securing his degree with highest honors in June 1820.
These included meeting former vice president Aaron Burr, who had returned to practicing law in New York following a self-imposed exile in Europe after his duel with Alexander Hamilton and treason trial.
Seward did not campaign in person, but ran affairs behind the scenes with Weed and made his views known to voters through a Fourth of July speech and lengthy letters, declining invitations to speak, printed in the papers.
[51] Seward continued his support of blacks, signing legislation in 1841 to repeal a "nine-month law" that allowed slaveholders to bring their slaves into the state for a period of nine months before they were considered free.
[47] As governor, Seward incurred considerable personal debt not only because he had to live beyond his salary to maintain the lifestyle expected of the office, but also because he could not pay down his obligation from the land company purchase.
He gained further publicity in association with Ohioan Salmon P. Chase when handling the unsuccessful appeal in the United States Supreme Court of John Van Zandt, an anti-slavery advocate sued by a slaveowner for assisting blacks in escaping on the Underground Railroad.
Other events, such as the 1852 publication of Uncle Tom's Cabin and Northern anger over the enforcement of the Fugitive Slave Act (an element of the Compromise), widened the divide between North and South.
[76] The issue was complicated by the Supreme Court's ruling the previous year in Dred Scott v. Sandford that neither Congress nor a local government could ban slavery in the territories.
[78] Discussing Dred Scott, Seward accused Buchanan and Chief Justice Roger B. Taney of conspiring to gain the result and threatened to reform the courts to eliminate Southern power.
[86] While campaigning for Republicans in the 1858 midterm elections, Seward gave a speech at Rochester that proved divisive and quotable, alleging that the U.S. had two "antagonistic systems [that] are continually coming into closer contact, and collision results ...
Brown was captured and executed; nevertheless, Mississippi representatives Reuben Davis and Otho Singleton each stated that if Seward or another Radical Republican was elected, he would meet with the resistance of a united South.
Lincoln had worked hard to gain a reputation as a moderate in the party and hoped to be seen as a consensus second choice, who might be successful in those critical states, of which the Republicans had to win three to secure the election.
He journeyed by rail and boat as far north as Saint Paul, Minnesota, into the border state of Missouri at St. Louis, and even to Kansas Territory, though it had no electoral votes to cast in the election.
[125] With the Sumter issue unresolved, Seward sent Lincoln a memorandum on April 1, proposing various courses of action, including possibly declaring war on France and Spain if certain conditions were not met, and reinforcing the forts along the Gulf of Mexico.
Seward was willing to wage war against Britain if it did and drafted a strong letter for the American Minister in London, Charles Francis Adams, to read to the Foreign Secretary, Lord Russell.
[135] In November 1861, the USS San Jacinto, commanded by Captain Charles Wilkes, intercepted the British mail ship RMS Trent and removed two Confederate diplomats, James Mason and John Slidell.
With two more such vessels under construction the following year, supposedly for French interests, Seward pressed Palmerston not to allow the warships to leave port, and, nearly complete, they were seized by British officials in October 1863.
Davis appointed commissioners (Vice President Alexander Stephens, former U.S. Supreme Court justice Campbell, and former Confederate Secretary of State Robert M. T. Hunter) to negotiate.
Seward advised a conciliatory veto message; Johnson ignored him, telling Congress it had no right to pass bills affecting the South until it seated the region's congressmen.
[170] Johnson suspended, then fired, Stanton over Reconstruction policy differences, leading to the president's impeachment for allegedly violating the Tenure of Office Act.
Seward remained conciliatory, and in January 1866, Napoleon agreed to withdraw his troops after a twelve- to eighteen-month period, during which time Maximilian could consolidate his position against the insurgency led by Benito Juárez.
[175][176] In December 1865, Seward bluntly told Napoleon that the United States desired friendship, but, "this policy would be brought into imminent Jeopardy unless France could deem it consistent with her interest and honor to desist from the prosecution of armed intervention in Mexico.
"[177] Napoleon tried to postpone the French departure, but the Americans had General Phil Sheridan and an experienced combat army on the north bank of the Rio Grande and Seward held firm.
After the Civil War, this was no longer an issue, and Seward became an ardent expansionist and even contemplated the purchase of Greenland and Iceland,[179] aiming to surround and then potentially annex Canada.
[181] Believing, along with Lincoln, that the U.S. needed a naval base in the Caribbean, in January 1865, Seward offered to purchase the Danish West Indies (today the United States Virgin Islands).
When Congress reconvened in December 1866, Seward caused a sensation by entering the chamber of the House of Representatives and sitting down with the administration's enemy, Congressman Stevens, persuading him to support an appropriation for more money to expedite the purchase of Samaná, and sent his son Frederick to the Dominican Republic to negotiate a treaty.
Both attempts fell through; the Senate, in the dying days of the Johnson administration, failed to ratify a treaty for the purchase of the Danish possessions, while negotiations with the Dominican Republic were not successful.
(It should be remembered that the purchase of Alaska from Russia was not inevitable; the land had the same latitude as Siberia and was very difficult to farm, while neither gold nor oil nor any other important mineral was discovered there until years after Seward's death.)