When this does not happen, and especially when one major party abruptly loses electoral strength, a minor party might replace a major party. The present [[Republican Party]] replaced the [[Whig Party]] in the 1850s over the issue of [[slavery]], for instance. | When this does not happen, and especially when one major party abruptly loses electoral strength, a minor party might replace a major party. The present [[Republican Party]] replaced the [[Whig Party]] in the 1850s over the issue of [[slavery]], for instance. |