Adding to this, if a group is walking together shoulder to shoulder taking up most of the sidewalk, it's that groups responsibility to stack when a single person is coming. The single walker should not have to move off the sidewalk to accommodate.

When walking on the sidewalk you pass on the right.

You walk on the right, but if someone is slow, and there's no room on the right, you can def pass them on the left. Like driving.

Fun fact, in Japan, they drive on the left. As a result, they also walk on the left on the sidewalk. However in Osaka, they walk up stairs and use escalators "international style" on the right. They still walk on sidewalks on the left side. The rest of the country is not like this.