| 1775 |
First Postmaster General under Continental Congress |
| 1789 |
First Postmaster General under Constitution |
| 1794 |
Post Office Act |
| 1829 |
Postmaster General became cabinet post |
| 1838 |
Congress declared all railroads post routes |
| 1847 |
Postage stamps |
| 1860 |
Pony Express |
| 1863 |
City delivery service |
| 1864 |
Money orders |
| 1896 |
Rural free delivery service |
| 1902 |
First omnibus public buildings law |
| 1910 |
Policy to build post offices near railroad stations |
| 1911 |
Postal savings |
| 1913 |
Public Buildings Act |
| 1913 |
Public Buildings Commission established to standardize public building construction |
| 1918 |
Airmail |
| 1926 |
Public Buildings Act (Keys-Elliot Act) |
| 1931 |
Federal Employment Stabilization Act required advance planning by Federal construction agencies |
| 1933 |
National Industrial Recovery Act established Public Works Administration |
| 1933 |
Public Works of Art Project |
| 1934 |
Treasury Department's Section of Painting and Sculpture (later called Section of Fine Arts) |
| 1935 |
Emergency Relief Appropriation Act established Works Progress Administration (later called Works Projects Administration) |
| 1938 |
Ramspeck-O'Mahoney Act put all postmasters within Civil Service and limited their political activity |
| 1939 |
Federal public buildings program transferred to the Federal Works Agency |
| 1948 |
Parcel post air service |
| 1949 |
Public Buildings Act of 1949 empowered the Commissioner of Public Buildings to employ private architectural firms in public buildings projects |
| 1950 |
One-day service in residential areas |
| 1954 |
Postal Service becomes responsible for all exclusively post office projects while GSA retains multi-user projects combining different Federal functions (i.e. courthouse, agency offices, and post office in one building) |
| 1955 |
Certified mail service |
| 1963 |
Zip codes |
| 1969 |
Patronage factor eliminated in appointments of postmasters |
| 1969 |
First postage stamp canceled on the moon |
| 1970 |
Postal Reorganization Act converted the Post Office Department to the U.S. Postal Service, an independent agency within the Executive Branch (Postmaster General left the President's cabinet in 1971) |
| 1971 |
National Service Standards |