The user search API says that the parameters are "cr" for country restrictions (s).
Parameter
'hl' is used to display the text of the results in a specific language (user interface language).
'gl' should be used if you want the results to match geolocation relevance.
Parameter
'lr' should be used in conjunction with or instead of the 'cr' parameter to limit the results to specification.
https://developers.google.com/custom-search/v1/cse/list
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