Terra Firma is an Alliance political party formed after the First Contact War. Its policy agenda is based on the principle that Earth must stand firm against alien influences. This covers a variety of legislation. Recent activities by Terra Firma include opposition to a law requiring high school align language study, a proposal to increase tariffs on alien imports, and leading a popular movement to mark the First Contact War with a public holiday.

Though founded by well-meaning individuals who feared the submersion of native human cultures under a wave of "alien vogue," Terra Firma's agenda attracts many jingoists and xenophobes.