As president, Pierce attempted to enforce neutral standards for civil service while also satisfying the Democratic Party's diverse elements with patronage, an effort that largely failed and turned many in his party against him. He was a Young America expansionist who signed the Gadsden Purchase of land from Mexico and led a failed attempt to acquire Cuba from Spain. He signed trade treaties with Britain and Japan and his Cabinet reformed its departments and improved accountability, but political strife during his presidency overshadowed these successes. His popularity declined sharply in the Northern states after he supported the Kansas–Nebraska Act, which nullified the Missouri Compromise, while many Southern whites continued to support him. The act's passage led to violent conflict over the expansion of slavery in the American West. Pierce's administration was further damaged when several of his diplomats issued the Ostend Manifesto calling for the annexation of Cuba, a document that was roundly criticized. He fully expected the Democrats to renominate him in the 1856 presidential election, but they abandoned him and his bid failed. His reputation in the North suffered further during the American Civil War as he became a vocal critic of President Abraham Lincoln.
