Andrew Carnegie devoted the later portion of his life attempting to create world peace. He established the Church Peace Union (CPU) in February 1914 with the belief that church congregations could become the basis of a grassroots movement to outlaw war. In a terrible irony, a few months later in July 1914, World War I began.
The founding members of the Church Peace Union were leaders from a variety of different religious backgrounds. In February 1914, they became signatories to resolutions directed to the political and religious leaders of Germany, Great Britain, and the United States, arguing that the needless costs of militarization were more harmful than beneficial.
The document attached on the right sidebar contains an excerpt of the full resolutions along with suggested analysis questions. The piece is interesting as a discussion exercise as many of the underlying reasons for peace still apply today. The full text of the resolutions can be found here.