What jobs were available for men in the 1890s?

The middle class didn't exist like it does today. There was a much greater income disparity at the end of the Gilded Age because most people were in the poor working class while a very few were in the exceptionally wealthy bourgeoise (capitalist) class. Most people fell towards one end or the other, though there was a tiny professional class of lawyers, medical "professionals", and small businessmen who were neither working class nor overly wealthy. I suppose the closest equivalent to "middle class" would be yeoman (independent) farmers because they were respected as landowners and constituted a near majority of Americans in 1900. Their working conditions and incomes were mostly on a working class level, but being landowners placed them above most urban workers.