I read a lengthy account of US Corporate history in graduate school (whose exact title eludes me at the moment). My impression is that in the US, there was a desire to tie transportation to broader physical markets, and include decreasing costs by owning the warehouse and distribution infrastructure. On the marketing end, a common brand name for a family of products was also owned by the corporation. An important early US example is the National Biscuit Company NABISCO. There were no US national food companies, as each market had the combination of brands, storage and distribution for the food product. The corporation held assets large enough to tie market regions together. It was not a small feat and was very much the Big Markets Tech of the time. Sears and Roebuck from Chicago form a different model, with non-perishable goods.
For international finance, early 20th century oil played a special role, not adequately described here.
As far as the parent comment about corporations "killing people" .. this is true but naive.. since the Romans and before, brutality was the norm, not the exception. Every educated person and most others knew about extreme forms of collective abuse, it had happened again and again. The very formation of civilization, including merchant and trade functions, was generally meant to be an improvement on past forms. Rarely, but with serious circumstance, some merchant company would rape and murder their way to fortune for a while. But karma is a bitch as they say, and those things did change. The tame history I cite above, was specifically aimed at making a better economic engine, for profit by ownership, which upon consideration was the chosen path.