The ranking the article links has the US below the nordic/germanic countries, but above most latin/eastern countries. As a European-American, that squares with my experience.
https://www3.weforum.org/docs/Global_Social_Mobility_Report....
raw data to save others the copy pasting i did into a spreadsheet:
{"Denmark": 85.2, "Finland": 83.6, "Norway": 83.6, "Sweden": 83.5, "Iceland": 82.7, "Netherlands": 82.4, "Switzerland": 82.1, "Austria": 80.1, "Belgium": 80.1, "Luxembourg": 79.8, "Germany": 78.8, "France": 76.7, "Slovenia": 76.4, "Ireland": 75, "Malta": 75, "Czech Republic": 74.7, "UK": 74.4, "Estonia": 73.5, "Portugal": 72, "Lithuania": 70.5, "USA": 70.4, "Spain": 70, "R Cyprus": 69.4, "Poland": 69.1, "Latvia": 69, "Slovakia": 68.5, "Italy": 67.4, "Croatia": 66.7, "Hungary": 65.8, "Bulgaria": 63.8, "Romania": 63.1, "Greece": 59.8 }