[savagedata]

You're looking to test the difference in proportions. I entered 0.93 / 1000 / 0.91 / 650 into this online calculator [1] and got a p-value of 0.14 which means that the difference is not statistically significant. Technically you would want to do some correction for multiple comparisons since your actual question is "are Americans more happy than workers in every other country?" not "are Americans more happy than Netherlanders specifically?" but it's a moot point since the difference already isn't significant.

A more important question is probably how the sampling was conducted. How did they guarantee a representative sample in each country? How did they account for the gig economy, small businesses, part-time employees, and employees paid under the table? So many ways a survey like this could be wrong.

[1] https://www.socscistatistics.com/tests/ztest/default2.aspx