“The All States Picnic is an Ontario tradition that began in 1939. The picnic is meant to recognize the diversity of Ontario residents and the states they had originally came from. Picnic tables were lined up along the Euclid Avenue median from Hawthorne to E Street with signs for each of the country’s 48 states (Hawaii and Alaska did not become states until 1959). The picnic boasted the “World’s Longest Picnic Table” according to Ripley’s Believe It or Not! The picnic was suspended briefly during World War II and again in 1981 when the number of native Californians began to outnumber those who came from out of state. The picnic was resumed again in 1991 for Ontario’s Centennial Anniversary and continues to be held on the 4th of July every year.
Source: Robert E. Ellingwood Model Colony History Room Collection Photo # 38″
Excerpt from http://www.ontariotownsquare.org/mural/1930s.html .