Belmont was a lifelong member of the
Democratic Party who first engaged in political campaigning in 1844, the same year he was naturalized as a citizen, by supporting
James K. Polk for president in the hotly contested
presidential election. The same year, he became the
consul general of the
Austrian Empire in New York City, representing the
Habsburg family in diplomatic matters throughout the
Mid-Atlantic States. He resigned the position in 1850 over objections to the regime's policies towards
Hungary, which had become a major
cause célèbre in the United States, and his growing interest in American politics.
1852 presidential campaign for president in 1852 and 1856. Around 1849, Belmont met
John Slidell, a leading member of the
Democratic Party in
Louisiana, through the
Union Club of the City of New York. By 1850, Slidell encouraged Belmont to enter politics. Belmont had voted for Democratic candidates since his naturalization in 1844, although most of his business acquaintances were nominal or active Whigs. With Slidell, Belmont backed the nomination of former
United States Secretary of State James Buchanan for president in 1852, hoping to unite New York in a coalition with
the South. To avoid the appearance of Southern interference, Slidell chose Belmont to manage the New York campaign. At the time, New York Democrats were deeply divided into
various factions over slavery, with anti-slavery "Barnburners" having bolted in
1848 to support the
Free Soil Party candidacy of
Martin Van Buren. Throughout 1851 and the spring of 1852, Belmont and Slidell worked to rally the factions to Buchanan, including by the purchase of the
New York Morning Star newspaper, but they failed to overcome
favorite son William L. Marcy or
Lewis Cass in the New York delegation. Efforts to unite behind Marcy or
Stephen A. Douglas at the
1852 Democratic National Convention also failed;
Franklin Pierce was nominated as an unexpected
dark horse. Belmont lent financial and political support to Pierce's campaign, bringing sustained attack from the city's Whig newspapers, which accused Belmont of using "Jew gold" from abroad to buy votes and maintaining "
dual allegiance" to the
Habsburg and
Rothschild families. Belmont demanded a retraction of at least one
Tribune story, but after he was rebuffed by
Horace Greeley, he enlisted the Democratic
Herald and
Evening Post in his defense. The journalistic war of words became known within New York City as the "Belmont affair."
Minister to the Netherlands (1853–57) Pierce won the
1852 election easily and appointed Buchanan and Belmont to diplomatic posts in the
United Kingdom and
the Netherlands, respectively. Belmont held the title of Chargé d'Affaires at
The Hague from October 11, 1853, until September 26, 1854, when the position's title was changed to Minister Resident. He continued as Minister Resident until September 22, 1857. In this role, Belmont successfully negotiated two treaties with the Dutch government: a new commercial treaty permitting American access to the
Dutch East Indies in 1855 and an extradition treaty in 1857.
Ostend Manifesto Shortly after Pierce's election, Belmont proposed to Buchanan a plan to purchase and annex
Cuba through military and diplomatic pressure on the unstable
Kingdom of Spain, along with financial pressure from the Rothschilds and other European banking houses which held Spanish government bonds and could threaten the government with bankruptcy. In the letter, Belmont proposed that President-elect Pierce could, through his ministers to London and the Bourbon monarchies in Paris and
Naples, create a diplomatic climate favorable to Spanish capitulation. For Naples, he recommended himself; Buchanan endorsed the plan and proposed it to Pierce, omitting Belmont's name. Belmont proposed the plan again to William Marcy upon learning that Marcy would become Secretary of State, adding that he was on good terms with the lover of
Maria Christina of the Two Sicilies. He continued to lobby Buchanan, Marcy, and Pierce, directly and through friends, for the appointment to Naples, but it was ultimately given to
Robert Dale Owen, and Belmont reluctantly accepted appointment to
The Hague. , proposing a plan to pressure
Spain into giving up the island which included diplomatic pressure, financial leverage, and bribery. His lobbying eventually led to the
Ostend Manifesto.|306x306px En route to The Hague, Belmont visited Buchanan and
Lionel de Rothschild in London and "several gentlemen of influence" in Madrid. He reported to Washington that Spain was unstable and desperate for financial relief, but also proposed rebellion in Cuba as an alternative to a direct sale, if blocked by "Castilian pride." In October 1853, Belmont requested from Marcy a "secret fund of $40,000 to $50,000" to bribe Spanish officials to support Cuban independence, and he opened backchannel negotiations with the Spanish Minister to The Netherlands, a personal friend who favored the sale. However,
Spain–United States relations soured quickly, driven by the bellicosity of
Pierre Soulé, the United States Minister to Spain, and the
Spanish Revolution of 1854, which installed a government less disposed to sell Cuba. Under sustained pressure from Belmont and other expansionists, President Pierce proposed that Buchanan, Soulé, and
John Y. Mason (the three leading American diplomats in Europe) deliver a report on the Belmont plan. Though Slidell proposed that Belmont participate "on account of the Rothschild influence at Madrid and Paris," he was not present at their meeting in
Ostend,
Belgium on October 9, 1854. Their report to Secretary Marcy, which favored an invasion of Cuba in the even that Spain refused to sell the island, became known as the
Ostend Manifesto. The Manifesto was swiftly doomed by its leak to the
New York Herald and the victory of
Pierce's opponents in the
1854 elections.
Gibson affair As chargé d'affaires, Belmont was tasked with negotiating a trade agreement which would allow American shipping in the
Dutch East Indies; his efforts were diverted by an
international incident over the arrest of American citizen and adventurer
Walter M. Gibson for
fomenting rebellion in the East Indies. Gibson had been arrested in 1851 for conspiring with the
Sultan of Djambi to overthrow Dutch authority on the island of
Sumatra. After he was
acquitted on a technicality, the Dutch Minister of Justice overturned the colonial court's decision and sentenced him to twelve years imprisonment. Gibson fled the East Indies for
Washington, where he arrived in 1853 and appealed to the Pierce administration for protection. He also sought support in pursuing an indemnity claim against the Dutch government for his arrest and destruction of his ship. Secretary Marcy and American public opinion backed Gibson. After initial resistance from the Dutch foreign ministry, the affair was inflamed in summer 1854 when Gibson, impatient with the State Department's handling of the case, arrived in The Hague personally to pursue his claims, falsely representing himself to Belmont as a special diplomatic agent appointed by Marcy. Gibson's presence undermined Belmont's negotiating position and riled Dutch public opinion, which demanded he be arrested as a fugitive from justice. Belmont's position was further weakened when he left the city for the mineral baths in
Bohemia, citing
rheumatism. While Belmont was on leave, Gibson stole his dossier on the case and left for
Paris, where he further told American minister
John Y. Mason that Belmont had appointed him special attaché. Gibson in turn represented himself around Paris as Mason's first secretary, leaking stories to
Horace Greeley's
New York Tribune which attacked Pierce's foreign policy by suggesting that Belmont utilized his diplomatic post as a banking house and was underwriting the
Russian Empire in the
Crimean War. Though Marcy thereafter dropped the issue and proceeded to ignore Gibson's claims, and both Marcy and President Pierce praised Belmont's handling of the affair, the entire incident did further damage to Belmont's public reputation in the United States. In addition to the
Tribune, the Democratic
New York Herald (which had turned on the Pierce administration politically, as the result of a patronage dispute) joined in antisemitic and xenophobic attacks on Belmont for the remainder of his tenure.
Buchanan years (1857–60) While at The Hague, Belmont strengthened his ties to James Buchanan, maintaining an active and flattering correspondence with his fellow diplomat. As President Pierce's domestic popularity waned over his handling of the
crisis in Kansas, Belmont expected Buchanan to be the next Democratic nominee and the likely President. Stateside, John Slidell organized members of Congress and bankers behind Buchanan for the 1856 nomination and lobbied Buchanan to resign from his post to openly stand as a candidate. He did in March 1856 and, after a visit to Belmont at The Hague, sailed home, where he was nominated and elected president. Belmont's role in the 1856 campaign was a matter of historical controversy; major accounts inaccurate imply he was in the United States, contributing thousands of dollars and planning campaign strategy. Biographer Irving Katz notes that Belmont did not return from Europe until November 1857 and, though he certainly committed money to the Buchanan campaign, no evidence exists as to an exact sum. Regardless of his exact role, he was again a subject of scrutiny and attack from the domestic press, who sought to tarnish Buchanan's image through connection to Belmont. Though Belmont hoped to receive a promotion within the diplomatic corps, Buchanan and
Lewis Cass, the new Secretary of State, offered him only another four years at The Hague; he declined and resigned his post. When he arrived in the United States, he found his party embroiled in a feud between President Buchanan and Senator
Stephen Douglas, who denounced the proslavery
Lecompton Constitution for the
Kansas Territory, which Buchanan supported. Belmont, who considered Douglas a personal friend and the likely Democratic nominee in 1860, nevertheless publicly endorsed Buchanan's stance in 1858, circulating a petition which urged Congress to admit Kansas into the Union as a slave state and defending the administration against "'Black' Republicans and Know-Nothings" in an Independence Day speech at
Tammany Hall. In 1858, Belmont lobbied to succeed
Augustus C. Dodge as Minister to Spain, but his request was ignored by the White House, in part because Buchanan hoped to appoint John Slidell as Minister to France and felt he could not appoint both men to prominent posts. The decision has also been attributed to Belmont's role in the Ostend Manifesto, which made him unsuitable for the sensitive post. The snub agitated Belmont, who broke with the administration permanently, and then broke with his wife's uncle Slidell, after Slidell refused to relay an angry letter from Belmont to the President. Belmont's switch from Buchanan to Douglas drew him into the more moderate "Softshell" faction of the New York party, which favored
a pluralist, democratic approach on the issue of slavery. In October 1859, he joined with
Samuel J. Tilden and others to organize the Democratic Vigilant Association, a predominantly mercantile group (especially those engaged in trade with the South) to combat "atrocious disunion doctrines," including the abolition of slavery. ==Chairman of the Democratic National Committee==