Question: How many US and Canadian cities eventually acquired lacrosse clubs?
About the article "Lacrosse", section "Box Lacrosse".

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Up until the 1930s, all lacrosse was played on large fields outdoors.
The owners of Canadian hockey arenas invented a reduced-size version of the game, called box lacrosse, as a means to make more profit from their arena investments, and because severe winter weather in many areas limits outdoor play.
Since 1985, when the Canadian University Field Lacrosse Association (CUFLA) began operating a collegiate men's league, field lacrosse has witnessed a revival in Canada.
There are now 12 varsity teams.
In 1994, Canada declared lacrosse its national summer sport in the .
In 1987, a men's professional box lacrosse league was started, called the Eagle Pro Box Lacrosse League.
This league changed its name to the Major Indoor Lacrosse League, then later to the Lacrosse League.
It grew to encompass men's lacrosse clubs in 14 cities throughout the United States and Canada.
Lacrosse is a traditional Indigenous people's game which was first encountered by Europeans when French Jesuit missionaries in the St. Lawrence Valley witnessed the game in the 1630s.
Lacrosse for centuries was seen a key element of cultural identity and spiritual healing to Native Americans.
It originated as a field game and was adopted first by Canadian, American, and English athletes as a field game, eventually settling on a 10 v 10 format.
Box lacrosse is a modern version of the game that was invented in Canada during the 1920s and 30s.
The roots of indoor lacrosse are obscure, but its invention has been attributed to one Paddy Brennan, a field lacrosse player and referee from Montreal, who, being annoyed by the constant slowing of play from balls going out of bounds in the field game, experimented with indoor games at the Mount Royal Arena during the early 1920s.
Joseph Cattarinich and Leo Dandurand, owners of the National Hockey League's Montreal Canadiens in the 1920s, led the participating ice hockey arena owners to introduce the new sport.
In the 1930s, 6 v 6 indoor lacrosse came to be played in the summer in unused hockey rinks.
Canadians adopted the new version of the sport quickly.
Eventually it became the more popular version of the sport in Canada, supplanting field lacrosse.
This form of was also adopted as the primary version of the game played on Native American reservations in the US and Canada by Iroquois and other Native peoples., It is the only sport in which the American indigenous people are sanctioned to compete internationally, participating as the Iroquois Nationals.
However, many field lacrosse enthusiasts viewed the new version of the sport with negativity.
The first professional box lacrosse games were held in 1931.
That summer the arena owners formed the "International Lacrosse League" featuring four teams: the Montreal Canadiens, Montreal Maroons, Toronto Maple Leafs, and Cornwall Colts.
The league only lasted two seasons.
In the wake of the original "International Lacrosse League" opened the "American Box Lacrosse League" featuring six teams: two in New York City, and one each in Brooklyn, Toronto, Boston, and Baltimore.
The league played to small crowds on outdoor fields such as Yankee Stadium and Fenway Park, before closing midway through its inaugural season.
Lacrosse was officially declared Canada's National Summer Sport with the passage of the "(Bill C-212)" on May 12, 1994.
Box lacrosse first appeared in Australia as early as 1930.
Newspaper articles at the time reported that the sport may have even been created in Australia, when two prominent Melbourne clubs played a six-a-side lacrosse match in a dance hall for charity.
By 1933, box lacrosse matches were being played in Adelaide, Brisbane, and Perth.
This new version of the game did not overtake the traditional version of lacrosse in popularity in Australia as happened in Canada.
The Canadian Lacrosse Association began sponsoring box lacrosse.
In 1932, the Mann Cup, the most prestigious lacrosse trophy in Canada, was contended for under box lacrosse rules for the first time.
Previously, the national senior men's lacrosse championship, awarded since 1901, was competed for under field lacrosse rules.
The Mann Cup is an annual tournament that presents the champion of the Western Lacrosse Association and Major Series Lacrosse in a best of seven national championship.
A few years later, in 1937, the Minto Cup, began being awarded under box lacrosse rules to the junior men's champions.
Currently the Canadian Lacrosse Association oversees the Mann Cup, the Minto Cup, the Presidents Cup (Senior B national championship) the Founders Cup (Junior B national championship) all under box lacrosse rules.
Briefly in 1939, a professional box lacrosse league started up in California, called the "Pacific Coast Lacrosse Association".
This four team league also folded shortly after opening.
Professional box lacrosse did not return to the United States again until 1968 when the Coquitlam Adanacs franchise played one Western Lacrosse Association season in Portland, Oregon.
A new professional indoor lacrosse league was created in the 1970s with the formation of the original National Lacrosse League.
This league opened in 1974 with teams in Montreal, Toronto, Rochester, Syracuse, Philadelphia, and Maryland.
For the 1975 season, Rochester moved to Boston, Syracuse moved to Quebec City, and Toronto moved to Long Island.
Thus, by its second year, the original NLL was playing in all major league arenas: The Quebec Colliseum, Montreal Forum, Boston Garden, Long Island Arena, Philadelphia Forum, and Capital Centre.
When the two wealthier '75 NLL franchises, Philadelphia and Maryland, finished out of the playoffs, and with Montreal losing access to the fabled Montreal Forum in the upcoming season due to the 1976 Montreal Olympic Games, the league folded after two seasons due to financial uncertainty.
The rebirth of professional box lacrosse in the United States came on March 13, 1986, with the formation of the "Eagle Pro Box Lacrosse League", which was incorporated by Russ Cline and Chris Fritz.
The league originated with four teams: the Philadelphia Wings, New Jersey Saints, Washington Wave, and Baltimore Thunder, and unlike box lacrosse generally, was played during the winter.
The league rebranded itself as the "Major Indoor Lacrosse League" (MILL) immediately after its second season, and in 1998 renamed itself again, this time to the NLL.
In 1998, the NLL entered into the Canadian market for the first time with the Ontario Raiders.
Although 6 of the league's 9 teams are based in American cities, more than two-thirds of the players are Canadian. 
US Lacrosse was founded on January 1, 1998.
It resulted from the merger of many different groups, including the Lacrosse Foundation, the United States Women's Lacrosse Association, the National Junior Lacrosse Association, the United States Lacrosse Officials Association, United States Lacrosse Coaches Association, United States Club Lacrosse Association, the US Lacrosse Intercollegiate Associates, the Central Atlantic Lacrosse League and National Intercollegiate Lacrosse Officials Association. 
The Women's Collegiate Lacrosse Associates (WCLA) is a national organization of 200+ non-NCAA, women's college lacrosse programs organized and run by US Lacrosse, the national governing body.
The mission of the WCLA is to promote the growth of women’s lacrosse nationwide.
Specifically, WCLA strives to provide an infrastructure in which collegiate clubs will compete and eventually crown a National Champion.
Leadership opportunities exist on the local, regional and national levels as WCLA is a representation of teams at all levels.
Until January 2011, the WCLA was known as The US Lacrosse Women's Division Intercollegiate Associates (WDIA). 
The National College Lacrosse League (NCLL) is a men's lacrosse league comprising mostly Eastern US college lacrosse clubs (non-varsity).
There are approximately 130 teams divided into 12 conferences.
The programs are split into Division I and Division II.
Many of the clubs are at schools that currently have varsity NCAA Men's lacrosse programs.
Conferences:  Blue Ridge Conference  Capitol Conference  Chesapeake Conference  Eastern Pennsylvania Conference  Empire East Conference  Empire West Conference  Keystone Conference  Liberty Conference  Midwest North Conference  Midwest South Conference  NY Metro Conference  Tidewater Conference