The likes of Module::Locate would seem appropriate here

use Module::Locate 'locate';

require $_
  for locate map "MyModule::$_", @country_code;
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Then to access the symbol tables

@{ $self->{data} }
  = map \%{ $MyModule::{"$_\::"}{Hash} }, @country_code;
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Both code examples neatly avoid eval STRING and comply with strictures.