public class accountListFromPicklistCtrl {
 @AuraEnabled
 public static List < String > getselectOptions(sObject objObject, string fld) {
  system.debug('objObject --->' + objObject);
  system.debug('fld --->' + fld);
  List < String > allOpts = new list < String > ();
  // Get the object type of the SObject.
  Schema.sObjectType objType = objObject.getSObjectType();
 
  // Describe the SObject using its object type.
  Schema.DescribeSObjectResult objDescribe = objType.getDescribe();
 
  // Get a map of fields for the SObject
  map < String, Schema.SObjectField > fieldMap = objDescribe.fields.getMap();
 
  // Get the list of picklist values for this field.
  list < Schema.PicklistEntry > values =
   fieldMap.get(fld).getDescribe().getPickListValues();
 
  // Add these values to the selectoption list.
  for (Schema.PicklistEntry a: values) {
   allOpts.add(a.getValue());
  }
  system.debug('allOpts ---->' + allOpts);
  allOpts.sort();
  return allOpts;
 }
    
    
    @AuraEnabled 
    public static List<account> getAccounts(String cont){
        List<Account> lstAccount = new List<Account>();
        
        for(account acc : [select id,Name,	Country__c,dedupe_account__c from account where dedupe_account__c = null AND Country__c =:cont]){
           lstAccount.add(acc); 
        }
        return lstAccount;
        
    }

}

<aura:component controller="accountListFromPicklistCtrl" implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,forceCommunity:availableForAllPageTypes,force:lightningQuickAction" access="global">
	<aura:handler name="init" value="{!this}" action="{!c.doInit}"/>
    
    <aura:attribute name="objInfo" type="account" default="{sobjectType : 'Account'}" />
    <aura:attribute name="ListOfAccount" type="List" />
    
     <div class="slds-p-around--large"> 
   <div class="slds-form-element">
      <label class="slds-form-element__label" for="select-01">Select Country</label>
      <div class="slds-select_container">
         <ui:inputSelect  aura:id="accCountryID" class="slds-select"  change="{!c.onPicklistChange}"/>
      </div>
   </div>
    </div>
      <div class="slds-p-around--large">
    <!--contacts table part--> 
   <table class="slds-table slds-table--bordered slds-table--cell-buffer">
      <thead>
         <tr class="slds-text-title--caps">
            <th>
               <span class="slds-truncate" title="Name">First Name</span>      
            </th>
            <th>
               <span class="slds-truncate" title="Country">Country</span>
            </th>
            <th>       
               <span class="slds-truncate" title="dedupe">dedupe account</span>
            </th>
            <th>       
                <span class="slds-truncate" title="createDep">Create Dedupe A/c</span>
            </th>
          
         </tr>
      </thead>
      <!--table body start, 
         Iterate contact list as a <tr>
         -->
      <tbody>
         <aura:iteration items="{!v.ListOfAccount}" var="acc">
            <tr>
               <td scope="row">
                  <div class="slds-truncate" title="{!acc.Name}"><a>{!acc.Name}</a></div>
               </td>
               <td scope="row">
                  <div class="slds-truncate" title="{!acc.LastName}">{!acc.Country__c}</div>
               </td>
               <td scope="row">
                  <div class="slds-truncate" title="{!acc.Department}">{!acc.dedupe_account__c}</div>
               </td>
               <td scope="row">
                   <div class="slds-truncate"> <lightning:button name="{!acc.Id}" variant="brand" label="New Dedupe" onclick="{! c.createDedupe }" /></div>
               </td> 
            </tr>
         </aura:iteration>
      </tbody>
   </table>
    </div>
    
</aura:component>

({
    doInit: function(component, event, helper) {
        helper.fetchPickListVal(component, 'Country__c', 'accCountryID');
 
    },
    onPicklistChange: function(component, event, helper) {
        // get the value of select option
        var country= event.getSource().get("v.value");
        var action = component.get("c.getAccounts");
        action.setParams({
            "cont": country
        });
      
        action.setCallback(this, function(response) {
            if (response.getState() == "SUCCESS") {
                var allValues = response.getReturnValue();
               component.set("v.ListOfAccount",allValues);     
            }
        });
        $A.enqueueAction(action);
    
    },
    
    createDedupe : function(component, event, helper) {
        var whichOneAccount = event.getSource().get("v.name");
        console.log(whichOneAccount);
        
        var createRecordEvent = $A.get("e.force:createRecord");
          createRecordEvent.setParams({
             "entityApiName": "dedupe_account__c"
    });
    createRecordEvent.fire();
       
    }
    
})

({
    fetchPickListVal: function(component, fieldName, elementId) {
        var action = component.get("c.getselectOptions");
        action.setParams({
            "objObject": component.get("v.objInfo"),
            "fld": fieldName
        });
        var opts = [];
        action.setCallback(this, function(response) {
            if (response.getState() == "SUCCESS") {
                var allValues = response.getReturnValue();
 
                if (allValues != undefined && allValues.length > 0) {
                    opts.push({
                        class: "optionClass",
                        label: "--- None ---",
                        value: ""
                    });
                }
                for (var i = 0; i < allValues.length; i++) {
                    opts.push({
                        class: "optionClass",
                        label: allValues[i],
                        value: allValues[i]
                    });
                }
                component.find(elementId).set("v.options", opts);
            }
        });
        $A.enqueueAction(action);
    },
    

})