1. Henry Ford was obsessed with soybean research - he had several labs at the Ford factory dedicated to it. In 1941 he had built a plastic car from soybean plastics. He also wore a suit made from soybean threads and invited newpaper reporters over to have primarily soy-based meal in his mansion (which had such amenities as heated bird baths) (Stuff).

2. Cesar Chavez and Coretta Scott King were vegans (Eating Animals).

3. The first Islamic caliphate is the first known government to successfully end slavery practices (debt)