Postage stamps and postal history of the United States applies to jurisdiction United States of America
Timeline
1639: First American Post Office set up in Boston
1672: New York City mail service to Boston
1674: Mail service in Connecticut
1683: William Penn begins weekly service to Pennsylvania and Maryland villages and towns
1693: Service between colonies begins in Virginia
1775: First postmaster general appointed: Benjamin Franklin
1799: U.S. Congress passes law authorizing death penalty for mail robbery
1813: First mail carried by steamboat
1832: First official railroad mail service
1847: First U.S. postage stamps issued
1857: Perforated stamps introduced
1860: Pony Express started
1861: Mailing of post cards authorized
1873: Prestamped "postal cards" introduced
1879: Postage due stamps introduced
1885: Special Delivery service introduced
1893: First commemorative event stamps: World's Columbian Exposition in Chicago
1913: Domestic parcel post delivery began
1918: First airmail stamps introduced; Inverted Jenny stamp error
1920: Transcontinental mail between New York City and San Francisco
1955: Certified Mail service introduced
1958: Well-known artists begin designing stamps
1963: 5-digit ZIP Codes introduced
1983: ZIP + 4 code introduced
1989: Priority Mail introduced
1992: Microprint introduced and first commemorative stamp developed entirely by offset lithography
1994: Legends of the West stamp error
1997: Special Delivery discontinued
2007: Forever stamps introduced