McWilliams was born in 1904 to a poor pioneer family in Hitchcock, Oklahoma. In his earlier days McWilliams was well known for using an American-flag-draped covered Conestoga wagon for publicizing his rallies and speeches, as well as for drawing attention to his cause.
McWilliams was born in 1904 to a low-income family in Hitchcock, Oklahoma. He became famous during his early days for using a decorated Conestoga wagon to promote his events and raise awareness about his issues.