In which phase of U. S. government regulation were major laws such as the Sherman Antitrust Act, the Clayton Act, and the Federal Trade Commission Act passed to maintain a competitive environment?

Anti - Monopoly Phase.

Explanation:

Anti - Trust laws were formed when there was a surge of businesses trying to gain monopoly in the markets. An example of such a business was the Standard Oil.

The Sherman anti - trust act of 1890 was formulated principally, to regulate competition among businesses. The law forbids competitive actions by entrepreneurs that are not in laid down agreement, as well as actions that seek to monopolise a given market.

The Clayton Anti - trust Act of 1914 was passed to discourage wrong business policies like Price fixtures not determined by the market, and attempts to take over the market by competitors.

The Federal Trade Commission Act of 1914 was primarily formed to fight against styles of competition which were unfair and deceptive. It also target's general trade acts which are unethical.

All these Anti - Trust Acts where formulated to curb monopoly.