The last-ever penny will be minted today in Philadelphia

We eliminated pennies in Canada in 2012 and the transition was a non-issue. The vast majority of retailers would round cash transactions to the nearest $0.05, but a few would round down to the nearest $0.05 in favor of the customer. https://en.wikipedia.org/wiki/Withdrawal_of_low-denomination...

Canadian cash is better than American cash in several ways: No penny, durable polymer banknotes (instead of dirty wrinkly cotton paper), colorful banknotes (instead of all green) that are easy to distinguish, $1 and $2 coins in wide circulation (instead of worn-out $1 bills).

I'll agree on all but one point. The cotton/linen notes feel so much better in the hand than the candy wrapper plastic of Canadian bills. I know it's a dumb reason, but I just hate the feeling.

Plus US dollars just have that smell to them. I wouldn't mind though if we rotated out some of the faces on the bills, e.g. Andrew Jackson

You do know who would be the first person to rotate in, don't you.