自由土壤党属于或作为为反对奴隶制在美国领土的扩张并反对蓄奴州加入美利坚合众国而创建于1848年的一美国政党的

• Of or being a U.S. political party founded in1848 to oppose the extension of slavery into U.S. territories and the admission of slave states into the Union.