Interestingly, in the past, the US federal government actively made efforts to keep private organizations from becoming too dominant. Here are just a few examples, from memory:
* The Bell system was broken up, resulting in a geographically distributed telecom network: https://en.wikipedia.org/wiki/Breakup_of_the_Bell_System : Your phone company was local.
* Banks could not cross state lines, resulting in a geographically distributed financial system: https://en.wikipedia.org/wiki/McFadden_Act : Your bank was always local.
* Banks were prohibited from entering riskier businesses, resulting in a compartmentalized system: https://en.wikipedia.org/wiki/Glass%E2%80%93Steagall_legisla... : Your bank did not try to sell you investments.
* Monopolies and oligopolies were routinely busted, resulting in less concentration in many industries: https://en.wikipedia.org/wiki/Competition_law#United_States_... .
The companies you dealt with every day were typically smaller, more local, more subject to competition, and less able to yield economic and political power, particularly at the national level.
Nowadays, power and resources seem to be far more concentrated.