First Appropriation for Overland Mail to California

“Bills authorizing an overland mail were introduced in Congress in 1855 and 1856, but they did not pass. On March 3, 1857, the Post Office Appropriations Bill, which bore an amendment authorizing an overland mail to California, became law. It provided $300,000 for a semimonthly service, or $450,000 for a weekly service, or $600,000 for a semi-weekly service.”