On March 27:

1964 - The Good Friday Earthquake, the most powerful earthquake in U.S. history at a magnitude of 9.2 strikes South Central Alaska, killing 125 people and inflicting massive damage to the city of Anchorage.

28th March 193 - Roman Emperor Pertinax is assassinated by Praetorian Guards, who then sell the throne in an auction to Didius Julianus.

March 30, 1981

President Ronald Reagan is shot while leaving the Washington Union Hotel in Washington, D.C.

Reagan’s assailant, later identified as 25-year-old John Hinckley Jr., approached the president as he left the hotel after speaking to a union convention,
and fired five to six shots from a .22 caliber gun in his direction.
The president later recalled in his autobiography that the shots sounded like firecrackers.
He turned to the agent next to him and said “what the hell is that?”
One bullet hit Reagan in the chest.
Immediately the Secret Service pulled Reagan into a waiting limousine and sped to George Washington University Hospital, where he walked into the emergency room on his own.
White House Press Secretary James Brady, a policeman and a Secret Service agent were also injured in the shooting.
Each man survived, but Brady sustained severe head injuries that caused permanent disability.

March 31, 1973

The Mississippi River reaches its peak level in St. Louis during a record 77-day flood.
During the extended flood, 33 people died and more than $1 billion in damages were incurred.

April 1, 1877
Ignoring the taunts of fellow miners who say he will only find his own tombstone,
prospector Edward Schieffelin begins his search for silver in the area of present-day southern Arizona.
Later that year, Schieffelin was not only alive and well, but he had found one of the richest silver veins in the West.
He named it the Tombstone Lode.

Located about 70 miles southeast of Tucson in the San Pedro Valley,
the Tombstone Mining District and the town of Tombstone quickly became major economic and social centers of the Southwest.