World History
1547 – Edward VI Crowned King of England
Advanced Protestant reforms in England.
1915 – First U.S. Coast Guard Operation Begins
Strengthened maritime safety and defense.
1986 – Space Shuttle Challenger Disaster
Altered space policy and public trust.
U.S. History
1878 – First Commercial Telephone Exchange Opens
Laid groundwork for modern communication.
1986 – Challenger Explodes Shortly After Launch
Prompted critical reforms in NASA operations.
2003 – Last Night of Communication with Space Shuttle Columbia
Preceded another major space tragedy.