Declared a string and assigned SOQL value as shown below. While running I am getting an error.
String country = 'United States';
String accountQuery = 'SELECT Id,BillingPostalCode,County_Name__c '+
'FROM Account WHERE zipCodeLen__c =9 AND AND BillingCountry = '+ Country;
System.QueryException: unexpected token: 'AND'
System.QueryException: expecting a colon, found 'United'