Corporations kidnapped the democratic process, imposing colonization of the Western United States, Hawaii, The Philippines and the economic colonization of Cuba, ushering in the Gilded Age of the Robber Barons.
Three Points:
Western Expansion of the US. The Railroad Corporations.
The Takeover of the Kingdom of Hawaii.
The Spanish-American war and the robber barons of the Gilded Age.
lal of these are historically accurate and you have a lot of research and writing to do but the foundations of your work are solid.