No, not all knives have "Made in USA" labels on them. The labeling of knives, or any product for that matter, with the country of origin can vary depending on several factors, including the manufacturer, brand, and the laws and regulations of the country where the product is sold.
While some knife manufacturers or brands based in the United States may proudly label their products as "Made in USA" to highlight their domestic production, many knives are manufactured in other countries, especially those with a strong history of knife-making and lower production costs.
In some cases, knives imported into the United States or other countries may still be labeled with their country of origin, as required by law. However, the specific regulations governing country-of-origin labeling can vary by region, and not all products are subject to the same labeling requirements.
It's essential for consumers to check the packaging or product descriptions for information about the origin of the knife if it's a crucial factor in their purchasing decision. Additionally, reputable knife brands often provide transparency about their manufacturing processes and the origins of their products, so researching the brand and its practices can help consumers make informed choices.