The first published rules of baseball were written in September of 1845 for a New York City "base ball" club called the 
Knickerbockers., founded volunteer firefighter and bank 
clerk Alexander 
 Cartwright, who is also commonly known as "the father of baseball". Cartwright would codify a new set of rules that 
would form the basis for modern baseball, calling for a diamond-shaped 
infield, foul lines and the three-strike rule. One important
 rule, the 13th, stipulated that the player need not be physically hit 
by the ball to be put out; this permitted the subsequent use of a 
farther-travelling hard ball. Evolution from the so-called "
Knickerbocker Rules" to the current rules is fairly well documented, thus abolishing the 
dangerous practice of tagging runners by throwing balls at them.

(Alexander Cartwright) 
On June 3, 1953, Congress officially credited Cartwright with 
inventing the modern game of baseball, and he is a member of the 
Baseball Hall of Fame. However, the role of Cartwright himself has been 
disputed. His authorship may have been exaggerated in a modern attempt 
to identify a single inventor of the game, although Cartwright may have a
 better claim to the title than any other single American.
Cartwright, a New York bookseller who later caught "gold fever", 
umpired
 the first-ever recorded U.S. baseball game with codified rules in 
Hoboken, New Jersey on June 19, 1846, the Knickerbockers played the first official game of 
baseball against a team of cricket players, the game 
ended, and the other team (The New York Nines) won, 22-1. Cartwright 
also introduced the game in most of the cities where he stopped on his 
trek west to California to find gold, beginning a new,  
American tradition.
In 1851, the game of baseball was already well-established enough 
that a newspaper report of a game played by a group of teamsters on 
Christmas Day referred to the game as, "a good old-fashioned game of 
baseball.

(New_York_Mutual_baseball_player 1857)
 
In 1857, sixteen clubs from modern 
New York City
 sent delegates to a convention that standardized the rules, essentially
 by agreeing to revise the Knickerbocker rules. In 1858, twenty-five 
including one from New Jersey founded a going concern but the 
National Association of Base Ball Players is conventionally dated from 1857. It governed through 1870 but it scheduled and sanctioned no games.
In 1858, clubs from the association played a cross-town, all-star 
series pitting Brooklyn clubs against clubs from New York and Hoboken.
On July 20, 1858, an estimated crowd of about 4,000 spectators watched 
New York and Hoboken defeat Brooklyn by a score of 22-18. The New York 
team included players from the Union, Empire, Eagle, Knickerbocker and 
Gotham clubs. The Brooklyn team included players from the clubs 
Excelsior, Eckford, Atlantic and Putnam.
In a return match held August 17, 1858, and played at the Fashion 
Course in the Corona neighborhood of Queens, a slightly smaller crowd 
cheered Brooklyn to a win over New York and Hoboken by a score of 29-8.
 New York won a third game in the series, also played at the Fashion Course, on September 10, 1858. It appears that admission fees were charged, as "surplus funds" from the games were to be donated to charity.
By 1862 some NABBP member clubs offered games to the general public in enclosed ballparks with admission fees.During and after the 
American Civil War,
 the movements of soldiers and exchanges of prisoners helped spread the 
game. As of the December 1865 meeting, the year the war ended, there 
were isolated Association members in 
Fort Leavenworth, 
St. Louis, 
Louisville, and 
Chattanooga, Tennessee, along with about 90 members north and east of 
Washington, D.C..
 
 (Jim_Creighton_Excelsior 1860 to 1862)

(Baseball uniforms 1870s)
 
In 1869 the first openly professional baseball team formed. Earlier players were nominally amateurs. The 
Cincinnati Red Stockings recruited nationally and effectively toured nationally, and no one beat them until June 
1870.
Already in the 19th century, the "old game" was invoked for special 
exhibitions such as reunions and anniversaries — and for making moral 
points. Today hundreds of clubs in the U.S. play "
vintage base ball" according to the 1845, 1858, or later rules (up to about 
1887),
 usually in vintage uniforms. Some of them have supporting casts that 
recreate period dress and manner, especially those associated with 
living history museums.
For more info visit:
http://en.wikipedia.org/wiki/Origins_of_baseball
xoxo
Lisa