The American Radio Relay League (ARRL) was founded in the second decade of the 20th century. It was established on April 6, 1914, making it one of the oldest and most prominent organizations dedicated to amateur radio enthusiasts in the United States.

Amateur radio, also known as ham radio, involves the non-commercial use of radio communication equipment for personal and community purposes. The ARRL was formed to support and advocate for amateur radio operators, providing them with a platform for collaboration, education, and representation within the regulatory and technical spheres of radio communication.

The ARRL's founding members included Hiram Percy Maxim and Clarence D. Tuska, both of whom were enthusiastic amateur radio operators. Hiram Percy Maxim, in particular, played a pivotal role in establishing the organization and served as its first president. His dedication to amateur radio and his advocacy for its growth and recognition laid the foundation for the ARRL's mission.

Over the decades, the ARRL has played a vital role in advancing the hobby of amateur radio. It has been actively involved in promoting technical innovation, emergency communication preparedness, and regulatory advocacy on behalf of amateur radio operators. The organization also publishes various resources, including magazines, books, and educational materials, to support the amateur radio community.

Additionally, the ARRL has been instrumental in representing the interests of amateur radio operators before regulatory bodies, such as the Federal Communications Commission (FCC) in the United States, to ensure that amateur radio remains a viable and vibrant hobby.

Since its founding in the second decade of the 20th century, the ARRL has continued to evolve and adapt to the changing landscape of radio communication technology. It remains a vital and respected organization within the amateur radio community, fostering innovation, camaraderie, and public service among radio enthusiasts across the United States.