* Feb. 9, 2005 – TransCanada proposes first Keystone pipeline, a 30-inch diameter pipe stretching 2,147 miles from Hardisty, Alberta, into Illinois.
* April 4, 2006 – TransCanada holds first Nebraska public meeting in Seward on Keystone pipeline.
* March 17, 2008 – U.S. State Department issues presidential permit for $5.2 billion Keystone pipeline.
* Sept. 19, 2008 – TransCanada makes application to State Department for Keystone XL pipeline.
* April 7, 2009 – Fifty Nebraskans gather at York City Auditorium to discuss pipeline concerns.
* March 2010 – Jane Kleeb founds Bold Nebraska, which has become one of the most prominent groups opposing the Keystone XL pipeline.
* May 2010 – Nebraskans question pipeline and risks to Ogallala Aquifer and Sandhills during three State Department hearings on Keystone XL pipeline in Nebraska.
* June 2010 – First Keystone pipeline begins operation, transporting 600,000 barrels a day.
* October 2010 – Gov. Dave Heineman and state Attorney General Jon Bruning each return $2,500 in political contributions from TransCanada in response to concerns about accepting funds from foreign corporations.
* Aug. 26, 2011 – State Department releases first environmental impact study which said Keystone XL would have limited environmental impact.
* Aug. 31, 2011 – Heineman asks President Barack Obama to reject Keystone XL because of danger to Sandhills and Ogallala Aquifer.
* September 2011 – Husker athletic department drops sponsorship agreement with TransCanada after backlash over “Husker Pipeline” video at Memorial Stadium.
* Sept. 27, 2011 – Hundreds -- for and against -- flock to Lincoln’s Pershing Center for U.S. State Department town hall meeting on Keystone XL.
* Nov. 1, 2011 – Legislature meets in special session called by Heineman because of growing public concern about proposed pipeline route through the Sandhills.
* Nov. 22, 2011 – Heineman signs Major Oil Pipeline Siting Act (LB1) and another bill (LB4) giving special consideration to the Keystone XL pipeline as part of deal struck to route the Keystone XL away from the Sandhills.
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* Jan. 18, 2012 – President Obama denies permit application for Keystone XL pipeline ahead of Feb. 21 deadline for action, saying timetable too tight for review of an alternative route in Nebraska.
* April 11, 2012 – Legislature passes LB1161 giving review of oil pipelines to the state Department of Environmental Quality and the governor authority to dole out eminent domain powers.
* May 4, 2012 – TransCanada reapplies for presidential permit.
* May 23, 2012 – Pipeline opponents file lawsuit challenging the Major Pipeline Siting Law in Lancaster County Court.
* Jan. 22, 2013 – Heineman voices approval of state environmental review and alternate pipeline route through Nebraska in letter to Obama administration.
* March 1, 2013 – U.S. State Department’s draft environmental impact statement draws heavy criticism for its take on climate change and groundwater contamination.
* June 25, 2013 – Obama says Keystone XL pipeline should only be approved if it doesn't worsen carbon pollution.
* September 2013 – Build Our Energy Barn constructed by opponents on the path of the proposed Keystone XL pipeline near Bradshaw.
* Jan. 22 – Oil begins moving through the Keystone Cushing Extension from Steele City to Cushing, Oklahoma.
* Jan. 31 – U.S. State Department issues long-delayed environmental impact report, which raises no major environmental objections and triggers national interest determination comment period.
* Feb. 19 – Lancaster County District Judge Stephanie Stacy rules LB1161 violates the state Constitution by shifting control over routing decisions of oil pipelines from the Public Service Commission to the governor and Nebraska Department of Environmental Quality.
* Feb. 28 – Nebraska Supreme Court takes up pipeline siting lawsuit following appeal of Judge Stacy’s decision by Nebraska attorney general.
* April 18 – U.S. State Department puts national interest determination process for Keystone XL on indefinite hold, saying the legal challenge to Nebraska’s pipeline siting law brings into question the path the pipeline would take.
* Friday – Attorneys will argue before state Supreme Court on constitutionality of amendment (LB1161) to Nebraska’s Major Pipeline Siting Law.