Editing Ontario, California (section)

==== 1900s ====
The City of Ontario's territory was greatly expanded in 1900.<ref name=":12" />

Tens of thousands of European immigrants came to work in agriculture. In the early 1900s, the first [[Filipino American|Filipinos]] and [[Japanese American|Japanese]] farm laborers arrived, and later many came to own plant nurseries.<ref>{{cite web |title=City History - DOIA |date=September 9, 2020 |url=https://downtownontario.org/city-history/}}</ref>

In 1901, the original college closed, and a new [[Ontario High School (California)|Ontario High School]] replaced it. This soon became [[Chaffey College]], and offered college courses as well as high school education.

Ontario was declared a "model colony" by an act of Congress in 1903.<ref>{{Cite web |title=Historic Preservation {{!}} City of Ontario, California |url=https://www.ontarioca.gov/Planning/HistoricPreservation |access-date=March 11, 2024 |website=www.ontarioca.gov}}</ref>

North Ontario broke away from the city in 1906, calling itself [[Upland, California|Upland]].<ref name=":12" />

In 1912, the streetcar line became the [[Upland–Ontario Line]] of [[Pacific Electric]]. It was closed in 1928.

In 1929, the city of Ontario established the Ontario Municipal Airport. This is now the [[Ontario International Airport]], and is the largest employer in the city.

AM radio station [[KSPA|KOCS]] began in 1946,<ref>{{Cite web |date=April 18, 2021 |title=Radio, radio {{!}} The David Allen Blog |url=http://www.insidesocal.com/davidallen/2008/04/25/radio-radio/ |access-date=March 11, 2024 |archive-url=https://web.archive.org/web/20210418134338/http://www.insidesocal.com/davidallen/2008/04/25/radio-radio/ |archive-date=April 18, 2021 }}</ref> which was followed by sister station [[KDEY-FM|KOCS-FM]] in 1947. The stations initially operated as part of The Daily Report, and would go on to change their name, format and ownership many times.

In 1960, the higher education part of Chaffey College moved to nearby Rancho Cucamonga.

From 1970 to 1980, the [[Ontario Motor Speedway]] hosted motor racing events including the [[California 500 (IndyCar)|California 500]], and music events like [[California Jam]].

The [[Cardenas (supermarket)|Cardenas]] supermarket chain began in Ontario in 1981.

''[[The Daily Report (Ontario, California)|The Daily Report]]'' merged with the nearby ''[[Progress Bulletin]]'' to become the ''[[Inland Valley Daily Bulletin]]'' in 1990.

An [[Ontario–East station|Ontario station]] of the [[Metrolink (California)|Metrolink]] rail service opened in 1993 (it later became known as "Ontario – East").

Large shopping mall [[Ontario Mills]] opened to the public on November 14, 1996, on the old Ontario Motor Speedway parking lot.

On December 13, 1996, [[AMC Theatres]] opened AMC Ontario Mills 30 in Ontario, which it billed as the "world's largest theater".<ref name="open2">{{cite book |last1=Hayes |first1=Dade |url=https://archive.org/details/openwidehowholly00haye |title=Open Wide: How Hollywood Box Office Became a National Obsession |last2=Bing |first2=Jonathan |publisher=Miramax Books |year=2004 |isbn=1401352006 |location=New York |pages=[https://archive.org/details/openwidehowholly00haye/page/311 311]-[https://archive.org/details/openwidehowholly00haye/page/317 317] |url-access=registration}}</ref> Three months later, [[Edwards Theaters]] opened the Edwards Ontario Palace 22 across the street.<ref name="open2" /> Ontario now had 52 screens on the one site, more than any other location in the United States.<ref name="open2" /> The opening of that many screens in the Inland Empire came about as the culmination of a lifelong rivalry between AMC's Stanley Durwood and Edwards Theaters' James Edwards.<ref name="open2" />  Edwards was infuriated when he learned Durwood had beaten him to a deal with Ontario Mills, and later told him, "I had to teach you a lesson".<ref name="open2" />

The Ontario Convention Centre opened in 1997.<ref>{{Cite web |date=March 1, 2022 |title=Ontario Convention Center Celebrates 25 Years! |url=https://gocvb.org/city-news/2022/03/01/ontario-convention-center-celebrates-25-years/ |access-date=March 11, 2024 |website=GOCal |language=en-US}}</ref>

In 1999, the large agricultural area in the south of Ontario (the "ag preserve") was rezoned for residential and commercial use. This area was now described as the "New Model Colony", before being renamed [[Ontario Ranch, California|Ontario Ranch]], and finally New Haven.<ref>{{Cite web |title=New Homes in Ontario, CA {{!}} New Haven Community |url=https://newhavenlife.com/ |access-date=March 11, 2024 |website=newhavenlife.com}}</ref>