You're describing the Gilded Age and part of the Second Industrial revolution in most textbooks. This would have been a period that focused on industrial processes and the "first" examples of consumerism with plenty of examples of advertisements for tobacco and alcoholic beverages to different groups in society. I think you can make a fair argument that this period was the one in which modern firearms were developed. You can also see the beginnings of mass production of cheap consumer goods like tinned beef and national breweries. I don't know of any good encyclopedias for inventions during a specific time period, but here are a few I know of:

Firearms: Smokeless powder, brass cartridges, lever action/bolt action firearms, high explosives such as dynamite, etc.

Medicine/Sanitation: the Pasteurization process, canning, refrigeration

Industry: the Bessemer Process for steel,