What landmark U.S. trademark law was enacted in 1946?

What landmark U.S. trademark law was enacted in 1946? It was the Lanham Act, also called the Trademark Act of 1946.

Enacted by Congress on July 5, 1946, the law created the foundation of the modern U.S. federal trademark-registration system. It established rules for registering marks, defining infringement, protecting marks from deceptive commercial use, and providing remedies for owners whose marks were misused.

The law is named for Representative Fritz G. Lanham of Texas, who sponsored the legislation in the House of Representatives. The act became effective in 1947 and replaced much of the earlier patchwork of federal trademark statutes, including the Trademark Act of 1905.

The wrong options belong to different legal or international contexts. The Paris Convention is an international intellectual-property treaty, the Madrid Protocol provides an international trademark-registration framework, and the Trademark Act of 1881 was an earlier U.S. statute. The Lanham Act remains the central federal trademark statute, though Congress has amended it substantially, including through later laws addressing dilution, cybersquatting, and false advertising.