Editing Sigma Pi (section)

===Early Growth: 1910 to World War II===
Sigma Pi continued to grow, co-founding the [[North American Interfraternity Conference]] (NIC) in 1910.<ref name = "Bairds1990" /> On July 15, 1911, Sigma Pi's official publication, ''The Emerald'', was first published.<ref name = "Bairds1990" /> It would not be regularly published until 1914.<ref name="IBelieve" /> The fraternity established its first chapter west of the [[Mississippi River]] in 1913 (Iota chapter at the [[University of California, Berkeley]]). World War I saw only Kappa chapter at [[Temple University]] close, though other chapters operated minimally. By 1918 there were 14 chapters.

The fraternity published ''The Songs of Sigma Pi'' in 1920 and established its first chapter in the [[American south]] (Omicron chapter at [[Tulane University]]).<ref>{{cite magazine|date=April 1920|volume=7|number=1|magazine=The Emerald of Sigma Pi|title=Songs of Sigma Pi|page=66|url=http://www.enivation.com/SigmaPi/archive/Emerald/1920/SP_EMERALD_VOL_7_NO_1_APR_1920.pdf|archive-url=https://web.archive.org/web/20170826031725/http://www.enivation.com/SigmaPi/archive/Emerald/1920/SP_EMERALD_VOL_7_NO_1_APR_1920.pdf|url-status=usurped|archive-date=August 26, 2017}}</ref> The Sigma Pi Foundation, an endowment fund, was established in 1922 and formally chartered in [[Indiana]] in 1923.<ref name = "Bairds1990" /><ref>{{cite magazine|last=Palmer|first=Cyrus E.|date=January 1922|volume=8|number=4|magazine=The Emerald of Sigma Pi|title=A Permanent Endowment Fund For Sigma Pi|pages=219–221|url=http://www.enivation.com/SigmaPi/archive/Emerald/1922/SP_EMERALD_VOL_8_NO_4_JAN_1922.pdf|archive-url=https://web.archive.org/web/20160820190745/http://www.enivation.com/SigmaPi/archive/Emerald/1922/SP_EMERALD_VOL_8_NO_4_JAN_1922.pdf|url-status=usurped|archive-date=August 20, 2016}}</ref>

Sigma Pi doubled its chapters between 1920 and 1927 and established a national office on May 16, 1927. It first operated out of Roselle, NJ, then Elizabeth, NJ.<ref name = offices>{{cite magazine|date=April 1929|volume=16|number=1|magazine=The Emerald of Sigma Pi|title=The New Quarters of the Executive Office|pages=8–10|url=http://www.enivation.com/SigmaPi/archive/Emerald/1929/SP_EMERALD_VOL_16_NO_1_APR_1929.pdf|archive-url=https://web.archive.org/web/20170826031642/http://www.enivation.com/SigmaPi/archive/Emerald/1929/SP_EMERALD_VOL_16_NO_1_APR_1929.pdf|url-status=usurped|archive-date=August 26, 2017}}</ref> The fraternity published its first pledge manual in 1931.<ref>{{cite magazine|date=November 1931|volume=18|number=3|magazine=The Emerald of Sigma Pi|title=The Pledge Manual|page=165|url=http://www.enivation.com/SigmaPi/archive/Emerald/1931/SP_EMERALD_VOL_18_NO_3_NOV_1931.pdf|archive-url=https://web.archive.org/web/20170826071210/http://www.enivation.com/SigmaPi/archive/Emerald/1931/SP_EMERALD_VOL_18_NO_3_NOV_1931.pdf|url-status=usurped|archive-date=August 26, 2017}}</ref> The ''Keryx'' newsletter also began publication in 1931. In 1937, the [[Mississippi State University]] chapter (Alpha-Lambda) became the first new chapter formed from a colony rather than consolidation.<ref name = Emerald1987>{{cite magazine|date=Winter 1987|volume=18|number=3|magazine=The Emerald of Sigma Pi|title=Ninety Years of Sigma Pi|pages=2–13|url=http://www.enivation.com/SigmaPi/archive/Emerald/1987/SP_EMERALD_VOL_74_NO_4_WINTER_1987|archive-url=https://web.archive.org/web/20170826030500/http://www.enivation.com/SigmaPi/archive/Emerald/1987/SP_EMERALD_VOL_74_NO_4_WINTER_1987|url-status=usurped|archive-date=August 26, 2017}}</ref> James Hauser became the first field representative that same year.<ref name=IBelieve />

By May 1940, Sigma Pi had 34 active and 2 inactive chapters and had begun using the ''I Believe'' pledge manual. [[World War II]] drastically reduced the fraternity to 11 active chapters by war's end.<ref name=IBelieve />