Unless there are specific choices I can only offer you a list of potential answers.
Sherman Act (1890), Federal Trade Commission Act (1914), and the Clayton Act (1914).
The Sherman Act outlawed all forms of monopolization and any attempts to do so. It also set strict penalties for any and all violations of this law.
The Federal Trade Commission Act of 1914 created the Federal Trade Commission which oversaw national business practices.
The Clayton Act addresses more specific points but especially focuses on preventing monopolies through regulation of mergers and acquisitions. It also goes on to prevent discriminatory pricing and dealings.
Further reading can be found on:
https://www.ftc.gov/tips-advice/competition-guidance/guide-antitrust-laws/antitrust-laws
Western Europe valued imperialism. For example, Great Britain was known for the numerous colonies that they had. There is a quote that states, "The Sun never sets on Great Britain" meaning that they had so many colonies around the world that the Sun never set on them. In addition, countries such as France and Spain also imperialized especially in the New Worl. However, Eastern Europe was always less developed than Western Europe so they didn't have the power to colonize countries. I hope this help! Good luck!