Image source: Getty Images On November 13, 2020, Michigan governor Gretchen Whitmer caused an uproar when she signed an executive order that gave Calgary-based Enbridge (TSX:ENB)(NYSE:ENB) 180 days to shut down its Line 5 pipeline, which ships 540,000 barrels of oil daily through the Great Lake States to Ontario. Enbridge claims Whitmer has no right to close Line 5. Whitmer said she’d seize Line 5’s profits (reportedly $1.3 million daily) if it doesn’t comply. And as May 12 was the “shutdown deadline,” most of us are wondering what will become of this North American feud. If you’re new to the issue, or if you’ve been watching from a distance, let’s take a step back. What exactly is Line 5, and why is its closure important to Canadians? Here’s what you need to know.