Which statement accurately describes the Know-Nothing Party?

The Know-Nothing Party, also known as the American Party, emerged in the mid-1850s largely as a response to the increasing wave of immigration, particularly from Ireland and Germany. Its foundation was based on xenophobia, with strong anti-Catholic and anti-immigrant sentiments. Members believed that immigrants were a threat to American values and jobs, leading them to advocate for restrictive immigration laws and policies that would favor native-born Americans.

This focus on anti-immigration sentiments defined the party's platform and attracted a significant following during a time when tensions regarding immigration and national identity were high. This context helps understand why the assertion about the party’s anti-immigration focus accurately describes its primary characteristic.

In contrast, the other options do not align with the core values and goals of the Know-Nothing Party. The party was not primarily focused on pro-slavery legislation, nor did it promote the expansion of civil rights. Additionally, while it was an attempt to consolidate certain political viewpoints, it did not aim to unite all factions but rather to create a distinctive identity centered on nativism and exclusionary policies.