In 1900 the eight National League teams were, in order of finish: Brooklyn, Pittsburgh, Philadelphia, Boston, Chicago, St. Louis, Cincinnati and New York.
If you're talking about the Modern Era (1900 to present) then it would be Roger Maris.
The National Association was the first major league in baseball and existed between 1871-1875. After it folded the National League was formed and has played continuously since 1876. The American League was founded in 1901.
Since 1900, two (2) teams share the Major League Baseball (MLB) record for most hits by a team in a single 9-inning game with 31 hits. The New York Giants did so against the Cincinnati Red on June 9, 1901 and the Milwaukee Brewers did so against the Toronto Blue Jays on August 28, 1992.
They were the Brooklyn Superbas, Chicago Orphans, Cincinnati Reds, New York Giants, Pittsburg Pirates, St Louis Cardinals, Philadelphia Phillies and the Boston Beaneaters.
The American League was founded in 1894 as a minor league and was known as the Western League. The name was changed to American League for the 1900 season and it remained a minor league. The American League declared itself a major league in 1901 and has been a major league ever since.
HVV were the winner of the Eredivisie league in 1900.
"Shoeless Joe Jackson's" real name was Joseph Jefferson Jackson. He played an outfielder in Major League Baseball in the early 1900's.
Aston Villa were the Football League Champions in 1900.
Rangers won the Scottish League Cup in 1900.
The White Sox, then called the White Stockings, began play in the American League in 1900 when the American League was still a minor league and the National League was the only major league. When the American League became a major league the next season (1901) the White Stockings were a charter member and won the first pennant of the American League as a major league.
Connie Mack, longtime manager of the Philadelphia Athletics in the early 1900's did stop managing until 1950 at the age of 86.