Answer by taking a quote from the following article:

Clarence Edwin "Cito" Gaston (; born March 17, 1944) is a former Major League Baseball outfielder and manager. His major league career as a player lasted from 1967 to 1978, most notably for the San Diego Padres and the Atlanta Braves. He spent his entire managerial career with the Toronto Blue Jays, becoming the first African-American manager in Major League history to win a World Series title. Cito Gaston managed the Toronto Blue Jays from 1989 to 1997, and again from 2008 to 2010.

As a coach and manager, Gaston was considered a player's manager. He was a soft-spoken and steady influence during years that saw a large group of talented, high-salaried players grace the Blue Jays uniform. The franchise led the Major Leagues in attendance each year from 1989 to 1992, setting new records each of the latter three years, riding high from a dedicated fan base and a new stadium to play in when Gaston took the helm. The Jays opened the SkyDome a few weeks after Gaston became manager and the financial success translated into major free agent signings, including pitcher Jack Morris, outfielder Dave Winfield, and designated hitter Paul Molitor. They also retained core All-Stars such as Joe Carter, Devon White, Roberto Alomar, and John Olerud. Joe Carter credits Gaston for the team's championships:  Cito knows how to work with each individual, treating everyone like a human being. He knows exactly what to say, when to say it, what to do and how to go about doing it. When you have a manager like that, it makes you want to play for the guy. We'd go to war for him. What Cito has done for the Blue Jays can't be taken lightly.  Gaston had worked with players at an individual level as a hitting instructor and transferred this to the job of manager. He was known for his open communication with his players. He was a successful game strategist, effectively handling National League rules during World Series games in Atlanta and Philadelphia. In the six games the Blue Jays played in those places during World Series play, the Jays went 4-2, including the title clincher in Game 6 of the 1992 World Series in Atlanta. The 1992 World Series victory was widely recognized as the first for a non-American team, and Gaston was the first ever African-American manager to win a World Series. The Blue Jays followed their 1992 success with a repeat victory in the 1993 World Series.

what year was the world series?
The 1992 World Series victory was widely recognized as the first for a non-American team,