Scholarship
William Walker (American National Biography)
Joseph A. Stout, Jr., "Walker, William," American National Biography Online, February 2000, http://www.anb.org/articles/20/20-01068.html.
Walker's government in Nicaragua was short-lived. He involved himself in an attempt to take over the Accessory Transit Company…. He chose the losing side in his support of this takeover effort and thus became the target of Cornelius Vanderbilt. Vanderbilt maintained control of the company and then set about obtaining the cooperation of Central American republics to overthrow Walker's regime. … With the specific assistance of Costa Rica, Walker's supply routes to the United States were severed, making his military defeat easy.