My aunt has my great-great-grandfather Carl Joseph Schneider's naturalization documents, and I have scanned copies of them. He declared his intention to become a citizen of the United States on 16 October 1894 at the St. Louis Court of Criminal Correction. He renounced his allegiance to the Emperor of Germany.
On 18 February 1898 at the St. Louis Court of Criminal Correction, he became a citizen of the United States. When he became a citizen, his wife and children also became citizens.