Managed to get them all right with one mistake. My thought process for this was basically, “Was this country owned by the British in the 20th century?”
I think some of the more interesting examples of this are when territories drive on a different side to the rest of the country. Hong Kong, Macau, and the US Virgin Islands all drive on the left even though China and the US drive on the right. And Gibraltar and the British Indian Ocean Territory drive on the right despite the UK driving on the left. There is also one single road in Bolivia that drives on the left despite the rest of the country driving on the right.
...and then there's the Cumbres de Acultzingo in Mexico, where you alternate back and forth between driving on the left and right as you travel along the road...
Knew Japan and therefore likely Thailand because a Japanese game theory teacher I had told us about how the Americans made people in Okinawa drive on the right, which meant (when Japan had to unify its ways) there had to be one of these complicated policy changes where you have to inform everyone that "on day x, we all drive on the other side", and make sure that doesn't cause accidents ...
As for the Marshall islands, just look at their pro-US and pro-Israel voting record in the UN ; no way it would be a country that is historically more influenced by the UK than the US.
But being an Asian, Bahamas almost caught me as its not on Geoguessr and I thought it would be the same as the us
Fun fact - China used to drive on the left as well.
Admittedly, that was over 100 years ago now, but still.
As for the Marshall islands, just look at their pro-US and pro-Israel voting record in the UN ; no way it would be a country that is historically more influenced by the UK than the US.