The Cubs will be the eighth team Jackson has played for in his MLB career
After signing a one-year deal worth $11 million with Washington, Jackson was 10-11 with a 4.03 ERA in 31 starts (189 2/3 innings) in 2012.
The Nationals declined to make Jackson a qualifying offer of one year, and $13.3 million this off-season.
Had they done so Washington would’ve guaranteed itself a first round draft pick if he signed elsewhere.
Instead the Nationals reached an agreement with Dan Haren on a one-year deal for $13 million.
Jackson pitched a no-hitter in 2010 while a member of the Arizona Diamondbacks and is known as a durable starter in the major leagues having made 31 starts in 2012 and 2011, 32 in 2010 and 33 and 2009.
Jackson has pitched for seven teams in his 10 year big-league career.