Citizen Know Nothing, the Know Nothing Party's nativist ideal
The Native American Party, renamed the American Party in 1855 and commonly known as the "Know Nothing" movement, was an
The "Know Nothings" believed a "
The collapse of the
The party declined rapidly after the 1856 election. The 1857
Anti-Catholicism had been a factor in colonial America but played a minor role in American politics until the arrival of large numbers of Irish and German Catholics in the 1840s.
 It then reemerged in nativist attacks on Catholic immigration. It appeared in
The name "Know Nothing" originated in the semi-secret organization of the party. When a member was asked about his activities, he was supposed to reply "I know nothing". Outsiders called them "Know Nothings" and the name stuck. In 1855, the Know Nothings first entered politics under the American Party label.  
The immigration of large numbers of
In 1849, an oath-bound
Immigration during the first five years of the 1850s reached a level five times greater than a decade earlier. Most of the new arrivals were poor Catholic peasants or laborers from Ireland and Germany who crowded into the tenements of large cities. Crime and welfare costs soared. Cincinnati's crime rate, for example, tripled between 1846 and 1853 and its murder rate increased sevenfold. Boston's expenditures for poor relief rose threefold during the same period.
In spring 1854, the Know Nothings carried Boston,
The results of the 1854 elections were so favorable to the Know Nothings, up to then an informal movement with no centralized organization, that they formed officially as a political party called the American Party, which attracted many members of the now nearly defunct
The historian Tyler Anbinder concluded:
The key to Know Nothing success in 1854 was the collapse of the
second party system, brought about primarily by the demise of the WhigParty. The Whig Party, weakened for years by internal dissent and chronic factionalism, was nearly destroyed by the Kansas–Nebraska Act. Growing anti-party sentiment, fueled by anti-slavery as well as temperanceand nativism, also contributed to the disintegration of the party system. The collapsing second party system gave the Know Nothings a much larger pool of potential converts than was available to previous nativist organizations, allowing the Order to succeed where older nativist groups had failed. 
In the spring of 1855,
Know Nothings scored victories in Northern state elections in 1854, winning control of the legislature in Massachusetts and polling 40% of the vote in Pennsylvania. Although most of the new immigrants lived in the North, resentment and anger against them was national and the American Party initially polled well in the South, attracting the votes of many former southern Whigs. 
The party name gained wide but brief popularity. Nativism became a new American rage: Know Nothing candy, Know Nothing tea and Know Nothing toothpicks appeared. Stagecoaches were dubbed "The Know Nothing". In
Historian John Mulkern has examined the party's success in sweeping to almost complete control of the Massachusetts legislature after its 1854 landslide victory. He finds the new party was populist and highly democratic, hostile to wealth, elites and to expertise and deeply suspicious of outsiders, especially Catholics. The new party's voters were concentrated in the rapidly growing industrial towns, where Yankee workers faced direct competition with new Irish immigrants. Whereas the Whig Party was strongest in high income districts, the Know Nothing electorate was strongest in the poor districts. They expelled the traditional upper-class closed political leadership class, especially the lawyers and merchants. In their stead, they elected working class men, farmers and a large number of teachers and ministers. Replacing the moneyed elite were men who seldom owned $10,000 in property. 
Nationally, the new party leadership showed incomes, occupation and social status that were about average. Few were wealthy, according to detailed historical studies of once-secret membership rosters. Fewer than 10% were unskilled workers who might come in direct competition with Irish laborers. They enlisted few farmers, but on the other hand they included many merchants and factory owners.  The party's voters were by no means all native-born Americans, for it won more than a fourth of the German and British Protestants in numerous state elections. It especially appealed to Protestants such as the Lutherans, Dutch Reformed and Presbyterians. 
The most aggressive and innovative legislation came out of Massachusetts, where the new party controlled all but three of the 400 seats—only 35 had any previous legislative experience. The Massachusetts legislature in 1855 passed a series of reforms that "burst the dam against change erected by party politics, and released a flood of reforms".  Historian Stephen Taylor says:
[In addition to nativist legislation], the party also distinguished itself by its opposition to slavery, support for an expansion of the rights of women, regulation of industry, and support of measures designed to improve the status of working people. 
It passed legislation to regulate railroads, insurance companies and public utilities. It funded free textbooks for the public schools and raised the appropriations for local libraries and for the school for the blind. Purification of Massachusetts against divisive social evils was a high priority. The legislature set up the state's first reform school for juvenile delinquents while trying to block the importation of supposedly subversive government documents and academic books from Europe. It upgraded the legal status of wives, giving them more property rights and more rights in divorce courts. It passed harsh penalties on speakeasies, gambling houses and bordellos. It passed prohibition legislation with penalties that were so stiff – such as six months in prison for serving one glass of beer – that juries refused to convict defendants. Many of the reforms were quite expensive; state spending rose 45% on top of a 50% hike in annual taxes on cities and towns. Extravagance angered the taxpayers and few Know Nothings were reelected. 
The highest priority included attacks on the civil rights of Irish Catholic immigrants. After this, state courts lost the power to process applications for citizenship and public schools had to require compulsory daily reading of the Protestant Bible (which the nativists were sure would transform the Catholic children). The governor disbanded the Irish militias and replaced Irish holding state jobs with Protestants. It failed to reach the two-thirds vote needed to pass a state constitutional amendment to restrict voting and office holding to men who had resided in Massachusetts for at least 21 years. The legislature then called on Congress to raise the requirement for naturalization from five years to 21 years, but Congress never acted.  The most dramatic move by the Know Nothing legislature was to appoint an investigating committee designed to prove widespread sexual immorality underway in Catholic convents. The press had a field day following the story, especially when it was discovered that the key reformer was using committee funds to pay for a prostitute. The legislature shut down its committee, ejected the reformer and saw its investigation become a laughing stock.    
The Know Nothings also dominated politics in Rhode Island, where in 1855
Fearful that Catholics were flooding the polls with non-citizens, local activists threatened to stop them. Tensions came to a head on 6 August 1855 in
In the South, the American Party was composed chiefly of ex Whigs looking for a vehicle to fight the dominant Democratic Party and worried about both the pro-slavery extremism of the Democrats and the emergence of the anti-slavery Republican party in the North.
 In the South as a whole, the American Party was strongest among former Unionist Whigs. States-rightist Whigs shunned it, enabling the Democrats to win most of the South.
David T. Gleeson notes that many Irish Catholics in the South feared the arrival of the Know-Nothing movement portended a serious threat. He argues:
In 1855, the American Party challenged the Democrats' dominance. In Alabama, the Know Nothings were a mix of former Whigs, malcontented Democrats and other political misfits; they favored state aid to build more railroads. In the fierce campaign, the Democrats argued that Know Nothings could not protect slavery from Northern abolitionists. The Know Nothing American Party disintegrated soon after losing in 1855. 
In Louisiana and Maryland, the Know Nothings enlisted native-born Catholics.
 Know Nothing congressman
The party declined rapidly in the North after 1855. In the
Many were appalled by the Know Nothings.
I am not a Know-Nothing – that is certain. How could I be? How can any one who abhors the oppression of negroes, be in favor of degrading classes of white people? Our progress in degeneracy appears to me to be pretty rapid. As a nation, we began by declaring that 'all men are created equal.' We now practically read it 'all men are created equal, except negroes.' When the Know-Nothings get control, it will read 'all men are created equals, except negroes and foreigners and Catholics.' When it comes to that I should prefer emigrating to some country where they make no pretense of loving liberty – to Russia, for instance, where despotism can be taken pure, and without the base alloy of hypocrisy. 
[Fillmore] was not a member of the party; he had never attended an American [Know-Nothing] gathering. By no spoken or written word had he indicated a subscription to American [Party] tenets. 
After the Supreme Court's controversial