during which war was the Emancipation Proclamation issued£¿

The U.S. Civil War -- or some call it the War Between the States.

http://www.archives.gov/historical-docs/document.html?doc=8&title.raw=Emancipation%20Proclamation

The Emancipation Proclamation was issued during the American Civil War. To find this answer, you can simply search online or consult history books that cover the topic of the Emancipation Proclamation.