Which McDonald's product was introduced nationally in 1983 and became a major branded menu item?

Chicken McNuggets were introduced nationally by McDonald's in 1983.

The bite-sized chicken product had been developed and tested before its nationwide introduction. Its distinctive name followed McDonald's established use of the “Mc” prefix, linking a new menu item to the broader corporate brand.

Chicken McNuggets became one of the chain's signature products and generated extensive packaging, advertising, and character-based promotion. Their success also expanded McDonald's branding beyond hamburgers and fries.

The 1983 national launch should not be confused with the earlier invention or regional testing of the product. The question asks when the item became a nationally available McDonald's menu product.