[citizen]

Not sure what that last means “that [Canada] wants their chunk of Ontario back” but it sounds interesting. What’s the story there?

[Little Pig]

I think he means the Upper Peninsula of Michigan.

[factoryrat]

Most of the lower peninsula of Michigan is covered in anywhere from 50 to 250 feet of glacial till, meaning all of the material scraped up from the bedrock by glaciers from the north, was deposited on the land as gravel, sand, and clay as the glaciers receded. Think of most of lower Michigan as one giant gravel pit. This geology is one reason why Michigan is known as the aggregate capital of the US. Along with being the limestone capital, Michigan is one of the largest concrete producers in the US. The joke is that most of that aggregate was scraped off of northern Ontario, and deposited on the lower peninsula of Michigan. Friends in Ontario get a chuckle out of that.