exchange-2.0/database/seeds/DatabaseSeeder.php

<?php

use Illuminate\Database\Seeder;

class DatabaseSeeder extends Seeder
{
    /**
     * Seed the application's database.
     *
     * @return void
     */
    public function run()
    {
        DB::beginTransaction();

        //General
        $this->call(CountriesTableSeeder::class);
        $this->call(CurrenciesTableSeeder::class);
        $this->call(StatesTableSeeder::class);
        $this->call(DistrictsTableSeeder::class);

        DB::commit();
    }
}