Deaths on June 20

John Clayton Adams, English painter (b. 1840)

John Clayton Adams or J. Clayton Adams (26 January 1840 – 20 June 1906) was an English landscape artist

8 Apr

Alzheimer's disease
Auguste Deter, the first person to be diagnosed with Alzheimer's disease, dies.
7 Jun

RMS Lusitania
Cunard Line's RMS Lusitania is launched from the John Brown Shipyard, Glasgow (Clydebank), Scotland.
18 Sep

Tsunami
A typhoon with tsunami kills an estimated 10,000 people in Hong Kong.
20 Sep

RMS Mauretania (1906)
Cunard Line's RMS Mauretania is launched at the Swan Hunter & Wigham Richardson shipyard in Newcastle upon Tyne, England.
9 Nov

Panama Canal
Theodore Roosevelt is the first sitting President of the United States to make an official trip outside the country. He did so to inspect progress on the Panama Canal.