When did motorcycle helmets become law?

Motorcycle helmets became mandatory by law at different times in different countries and states. In the United States, for example, the federal government introduced a law requiring all states to have helmet laws for Motorcycle riders in 1967. However, not all states have enacted universal helmet laws, and the specific requirements for helmet use vary by state. It's always important to check the helmet laws in your particular location to ensure compliance and safety while riding a Motorcycle.