It was first proposed in the mid 1850s by doctor Ignaz Semmelweis who believed it would reduce mortality rates. It became a widespread thing around 1900 when everyone started doing it because they realized how important decontamination was.
I will get 50 points for this hahahhahahahahha Explanation:
Answer:
The telegram was an internal diplomatic message sent in January 1917 from the German foreign secretary Arthur Zimmermann in Berlin, to the German Embassy in Mexico. It proposed a military alliance between Germany and Mexico, in the event of the United States entering the First World War in support of the Allies.
