SpaceX, the rocket firm founded and run by Elon Musk, has nabbed billions of dollars of government contracts last year, helping the company earn the 145th spot on Forbes’ annual list of America’s Largest Private Companies. Also making its debut is Sazerac, the liquor company owned by billionaire William Goldring, which enters the list at No. 207 with estimated revenue of $3 billion. Cargill kept i