September 1905

Friday 01:

Alberta and Saskatchewan join the Canadian confederation.

Tuesday 05:

Russo-Japanese War: In New Hampshire, USA, the Treaty of Portsmouth, a treaty mediated by US President Theodore Roosevelt, is signed by victor Japan and defeated party Russia.

Saturday 23:

Norway and Sweden sign the "Karlstad treaty", officially ending the Union between the two countries peacfully.

Wednesday 27:

Albert Einstein publishes the paper "Does the Inertia of a Body Depend Upon Its Energy Content?" in Annalen der Physik. This paper revealed the relationship between energy and mass.