Question: What are the two main countries in which lacrosse is played?
About the article "Lacrosse", section "International lacrosse".

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This is a list of nations that are represented by lacrosse national governing bodies.
This list indicates which countries have participated in the various international lacrosse competition sponsored by the Federation of International Lacrosse.
The Federation of International Lacrosse oversees international lacrosse. 
The Federation of International Lacrosse (FIL) is the international governing body of lacrosse and it oversees field, women's and box lacrosse competitions.
In 2008, the "International Lacrosse Federation" and the "International Federation of Women's Lacrosse Associations" merged to form the FIL.
The former "International Lacrosse Federation" was founded in 1974 to promote and develop the game of men's lacrosse throughout the world.
The FIL now sponsors the World Lacrosse Championship and Under-19 World Lacrosse Championships which are played under field lacrosse rules.
It also oversees the World Indoor Lacrosse Championship played under box lacrosse rules, and the Women's Lacrosse World Cup and an under-19 championship under women's lacrosse rules. 
The World Lacrosse Championship began as a four-team invitational tournament in 1967 sanctioned by the International Lacrosse Federation.
The 2006 World Lacrosse Championship featured a record twenty-one competing nations.
The 2010 World Lacrosse Championship took place in Manchester, England.
Only United States, Canada, and Australia have finished in the top two places of this tournament.
Since 1990, the Iroquois Nationals, a team consisting of the Six Nations of the Iroquois Confederacy members, have competed in international competition.
This team is the only Native American team sanctioned to compete in any men's sport internationally.
The Federation of International Lacrosse also sanctions the Under-19 World Lacrosse Championships.
The 2008 Under-19 World Lacrosse Championships included twelve countries, with three first-time participants: Bermuda, Finland, and Scotland.
Other regional international competitions are played including the European Lacrosse Championships, sponsored by the twenty-one member European Lacrosse Federation, and the eight team Asian Pacific Lacrosse Tournament. 
Box lacrosse is played by teams of six on a hockey rink where the ice has been removed or covered by artificial turf, or in an indoor soccer or lacrosse field.
The enclosed playing area is called a box, in contrast to the open playing field of the traditional game.
This version of the game was introduced in the 1930s to promote business for hockey arenas, and within several years had nearly supplanted field lacrosse in Canada.
Box lacrosse is played at the highest level by the "Senior A" divisions of the Canadian Lacrosse Association and the National Lacrosse League (NLL).
The National Lacrosse League employs some minor rule changes from the Canadien Lacrosse Association (CLA) rules.
Notably, the games are played during the winter.
The NLL games consist of four fifteen-minute quarters compared with three periods of twenty minutes each (similar to ice hockey) in CLA games (multiple 15-minute OT periods for tied games, until whoever scores first).
NLL players may use only sticks with hollow shafts, while CLA permits solid wooden sticks.
:The goals in box lacrosse are much smaller than field lacrosse, traditionally wide by tall in box, and wide by tall in the NLL.
Also, the goaltender wears much more protective padding, including a massive chest protector and armguard combination known as "uppers", large shin guards known as leg pads (both of which must follow strict measurement guidelines), and ice hockey-style masks or lacrosse helmets.
Also, at the professional level, box lacrosse goaltenders often use traditional wooden sticks outside of the NLL, which does not allow wooden sticks.
This makes Box Lacrosse faster and rougher than the traditional Field Lacrosse.
The style of the game is quick, accelerated by the close confines of the floor and a shot clock.
The shot clock requires the attacking team to take a shot on goal within 30 seconds of gaining possession of the ball.
In addition, players must advance the ball from their own defensive end to the offensive side of the floor within 10 seconds.
Box lacrosse is also a much more physical game.
Since cross checking is legal in box lacrosse, players wear rib pads in addition to the shoulder and elbow pads that field lacrosse players wear.
Box lacrosse players wear a different type of helmet as well, a hockey helmet with a box lacrosse cage.
For most penalties, the offending player is sent to the penalty box and his team has to play without him (thus lacking one player) for a short amount of time.
Most penalties last for two minutes, unless a five-minute major penalty has been assessed.
What separates box lacrosse (and ice hockey) from other sports is that at the top levels of professional and junior lacrosse, a five-minute major penalty is given and the players are not ejected for participating in a fight. 
Box lacrosse, also known as indoor lacrosse and sometimes shortened to boxla or simply box, is an indoor version of lacrosse played mostly in North America.
The game originated in Canada, where it is the most popular version of the game played in contrast to the traditional field lacrosse game.
It is played between two teams of six players each, and is traditionally played on an ice hockey rink once the ice has been removed or covered.
The playing area is called a box, in contrast to the open playing field of field lacrosse.
The object of the game is to use a long handled racket, known as a lacrosse stick, to catch, carry, and pass the ball in an effort to score by ultimately hurling a solid rubber lacrosse ball into an opponent's goal.
At the highest level box lacrosse is represented by the "Senior A" divisions of the Canadian Lacrosse Association (Western Lacrosse Association of the British Columbia Lacrosse Association and Major Series Lacrosse of the Ontario Lacrosse Association), and the National Lacrosse League (NLL).
While there are thirty-one total members of the Federation of International Lacrosse (FIL), only eight nations have competed in international box lacrosse competition.
Only Canada, Iroquois Nationals and the United States have finished in the top three places at the ILF World Indoor Lacrosse Championships.