All Countries of the World from West to East by Geographical Center
Countries are sorted by longitude of their Geographical Center, going from West to East: can you list them all? Start with the Westernmost country in the Americas!
Data from Portland State University (https://www.pdx.edu/econ/country-geography-data), for missing countries from CIA (https://www.cia.gov/library/publications/the-world-factbook/fields/2011.html)
Numbers are colours to highlighted 'isolated' countries: a darker colour means a higher distance in longitude to the nearest country