Question: What is the nationality of the player acquired by New Jersey Nets from Portland Trail Blazers in the 1990-91 season ?

Context paragraphs:
1989–90 Portland Trail Blazers season: The 1989–90 NBA season was the 20th season for the Portland Trail Blazers in the National Basketball Association.  During the offseason, the Blazers acquired All-Star forward Buck Williams from the New Jersey Nets.  The Blazers finished with a franchise-high 59–23 record and returned to the NBA Finals for the first time since their championship season of 1976–77.  However, they were unsuccessful in capturing their second NBA title, as they fell to the Detroit Pistons four games to one.

History of the Portland Trail Blazers: The following is a detailed history of the Portland Trail Blazers, a professional basketball team which joined the Western Conference of the National Basketball Association in 1970.  They play at the Moda Center in the Lloyd District of Portland.  They are owned by Microsoft co-founder and Vulcan Inc. chairman Paul Allen, who purchased the team in 1988.  The team is often referred to as "Rip City", which was coined by play-by-play announcer Bill Schonely during their inaugural season.  The Trail Blazers have retired several players jerseys, including Naismith Memorial Basketball Hall of Fame members Clyde Drexler and Bill Walton.  Jack Ramsay, who was the Trail Blazers head coach from 1976 to 1986, had the number 77 retired in honor of Portland's only NBA Finals victory in 1977.  Portland has had four NBA Rookies of the Year; Geoff Petrie (1971), Sidney Wicks (1972), Brandon Roy (2007) and Damian Lillard (2013).  The only NBA Most Valuable Player that earned the award as a member of the Trail Blazers was Bill Walton in 1978.

Portland Trail Blazers all-time roster: The Portland Trail Blazers, commonly known as the Blazers, are an American professional basketball team based in Portland, Oregon.  They play in the Northwest Division of the Western Conference in the National Basketball Association (NBA).  The Trail Blazers originally played their home games in the Memorial Coliseum, before moving to the Rose Garden in 1995.  The franchise entered the league in 1970, and Portland has been its only home city.  The franchise has enjoyed a strong following; from 1977 through 1995, the team sold out 814 consecutive home games, the longest such streak in American major professional sports.  The Trail Blazers are the only team in the major professional North American sports leagues located in the state of Oregon.  The Trail Blazers are also currently the only NBA team based in the binational Pacific Northwest, after the Vancouver Grizzlies relocated to Memphis and became the Memphis Grizzlies in 2001, and the Seattle SuperSonics relocated to Oklahoma City and became the Oklahoma City Thunder in 2008.

The Breaks of the Game: The Breaks of the Game is a 1981 sports book written by Pulitzer Prize winning reporter David Halberstam about the Portland Trail Blazers' 1979–1980 season.  The Trail Blazers are a professional basketball team which plays in the National Basketball Association (NBA).  Aside from a recap of the Blazers' season, the book attempts to give a detailed history of the NBA, the 1976–77 Portland Trail Blazers championship team, the injuries faced by departed star Bill Walton, and the life of Kermit Washington after his two-month suspension for punching Rudy Tomjanovich.  The book also puts basketball into a social context and contains extensive discussion on race in the NBA.

Maurice Lucas: Maurice Lucas (February 18, 1952 – October 31, 2010) was an American professional basketball player.  The first two years of his postcollegiate career were spent in the American Basketball Association (ABA) with the Spirits of St. Louis and Kentucky Colonels.  He then played twelve seasons in the National Basketball Association (NBA) with the Portland Trail Blazers, New Jersey Nets, New York Knickerbockers, Phoenix Suns, Los Angeles Lakers and Seattle SuperSonics.  The starting power forward on the Trail Blazers' 1976–77 NBA Championship team, he was nicknamed The Enforcer because of his primary role on the court which was best exemplified in Game 2 of the NBA Finals that season.

Dražen Petrović: Dražen Petrović (; October 22, 1964 – June 7, 1993) was a Croatian professional basketball player.  A shooting guard, he initially achieved success playing professional basketball in Europe in the 1980s, before joining the National Basketball Association (NBA) in 1989.

1989–90 New Jersey Nets season: The 1989–90 NBA season was the Nets' 23rd season in the National Basketball Association, and 14th season in East Rutherford, New Jersey.  The Nets decided to start the rebuilding process by acquiring Sam Bowie from the Portland Trail Blazers on draft day.  Under new head coach Bill Fitch, they started the season winning their first two games, but went on to lose eleven of their next twelves games, including a nine-game losing streak.  At midseason, the team acquired Chris Dudley from the Cleveland Cavaliers.  The Nets struggled all season long posting a 14-game losing streak between January and February, and losing eleven consecutive games in March.  They lost their final seven games of the season, finishing last place in the Atlantic Division with a league worst record at 17–65.  Following the season, Dennis Hopson was traded to the Chicago Bulls.

Chris Engler: Chris Engler (born March 1, 1959) is an American former National Basketball Association (NBA) player.  Engler was drafted from the University of Wyoming by the Golden State Warriors in the third round of the 1982 NBA draft.  Engler began his collegiate career with the Minnesota Golden Gophers before transferring to Wyoming.  Engler played two seasons with the Warriors, then subsequently had short stints with the Milwaukee Bucks, Chicago Bulls, New Jersey Nets, and Portland Trail Blazers before staying with the Nets for the final two seasons of his NBA career.  Engler finished with career averages of 1.8 points per game and 2.0 rebounds per game.

1990–91 New Jersey Nets season: The 1990–91 NBA season was the Nets' 24th season in the National Basketball Association, and 15th season in East Rutherford, New Jersey.  After finishing with the worst record last season, the Nets won the draft lottery and selected Derrick Coleman out of Syracuse with the first pick in the 1990 NBA draft.  In the offseason, the team acquired Reggie Theus from the Orlando Magic.  However, the Nets continued to struggle losing eleven consecutive games between December and January.  Their movement would continue at midseason as they acquired Dražen Petrović from the Portland Trail Blazers, and rookie Terry Mills from the Denver Nuggets.  The Nets finished fifth in the Atlantic Division with a 26–56 record.  Coleman had a stellar rookie season averaging 18.4 points and 10.3 rebounds per game, as he was named Rookie of The Year.  Following the season, Theus retired.

Dave Wohl: David Bruce Wohl (born November 2, 1949) is an American former basketball player and coach, and the current general manager of the Los Angeles Clippers.  A 6'2" guard who grew up in East Brunswick Township, New Jersey and played collegiately at the University of Pennsylvania, Wohl was selected in the 3rd round of the 1971 NBA draft by the Philadelphia 76ers.  He played for six different teams over a seven-year career, including the 76ers, the Portland Trail Blazers, the Buffalo Braves, the Houston Rockets and the New York/New Jersey Nets.

Supporting paragraphs: 1990–91 New Jersey Nets season Dražen Petrović
Answer: Croatian