When was the first 35mm camera invented and how did it affect photographers approach to capturing everyday life?

The first practical 35Mm still camera(as opposed to movie types) was the Ur-Leica designed by Oscar Barnack orignally in l9l3 it was on hold during the war(WWl) and WA snot offered commercially until about l923 or l924-=Germany in a severe mnetary crisis a the time. Leica pretty much controlled early 35-dom but it should be noted the traditonal Leica M-series very adpatable to press and candid if not clandestine photograpohy(the Fed camera was a SOVIET VERSIONOF THE LEICA II and was used and marked for service with the N.K.V.D. ( i have one of these).. these were not reflex camras so had a degree of parallax-difference between what was in the sight and what you get on film-mnodern slrs avoid this hazard completely. Leicas wee and are made by Ernst ZLeitz Ltd. of Wetzlar. The Fed was a Russian copy made by the Fed works in the Soviet Ukraine.