Auerbach, Inge. Hessische Auswanderer [Hesaus] Band II. Auswanderer aus Hessen-Kassel 1840-1850. Marburg, 1988. [Lists of Emigrants - many going to America]. [FHL 943.41 W29a Vol. 2 - Name index].
A search on Amerika in the Casselische Polizey- und Commerzien-Zeitung [see under Newspapers] has many references of individuals in Amerika, many who died in the Revolution. Some stayed in America after the war such as Johann Caspar Eff of Herges.