Laravel DatabaseSeeder estados(ufs) e municipios brasileiros

DatabaseSeeder.php

<?php

namespace Database\Seeders;

// use Illuminate\Database\Console\Seeds\WithoutModelEvents;
use Illuminate\Database\Seeder;
use Illuminate\Support\Facades\DB;

class DatabaseSeeder extends Seeder
{
    /**
     * Seed the application's database.
     *
     * @return void
     */
    public function run()
    {
        // \App\Models\User::factory(10)->create();
        $email = 'user@email.com';
        DB::table('users')->where('email', $email)->delete();
        DB::table('users')->insert([
            'name' => 'User',
            'email' => $email,
            'password' => bcrypt('password'),
        ]);

        DB::table('municipios')->truncate();
        DB::table('ufs')->delete();

        DB::table('ufs')->insert([
            ["nome" => "Acre",                "sigla" => "AC", "cd_ibge" => 12],
            ["nome" => "Alagoas",             "sigla" => "AL", "cd_ibge" => 27],
            ["nome" => "Amapá",               "sigla" => "AP", "cd_ibge" => 16],
            ["nome" => "Amazonas",            "sigla" => "AM", "cd_ibge" => 13],
            ["nome" => "Bahia",               "sigla" => "BA", "cd_ibge" => 29],
            ["nome" => "Ceará",               "sigla" => "CE", "cd_ibge" => 23],
            ["nome" => "Distrito Federal",    "sigla" => "DF", "cd_ibge" => 53],
            ["nome" => "Espírito Santo",      "sigla" => "ES", "cd_ibge" => 32],
            ["nome" => "Goiás",               "sigla" => "GO", "cd_ibge" => 52],
            ["nome" => "Maranhão",            "sigla" => "MA", "cd_ibge" => 21],
            ["nome" => "Mato Grosso",         "sigla" => "MT", "cd_ibge" => 51],
            ["nome" => "Mato Grosso do Sul",  "sigla" => "MS", "cd_ibge" => 50],
            ["nome" => "Minas Gerais",        "sigla" => "MG", "cd_ibge" => 31],
            ["nome" => "Pará",                "sigla" => "PA", "cd_ibge" => 15],
            ["nome" => "Paraíba",             "sigla" => "PB", "cd_ibge" => 25],
            ["nome" => "Paraná",              "sigla" => "PR", "cd_ibge" => 41],
            ["nome" => "Pernambuco",          "sigla" => "PE", "cd_ibge" => 26],
            ["nome" => "Piauí",               "sigla" => "PI", "cd_ibge" => 22],
            ["nome" => "Rio Grande do Norte", "sigla" => "RN", "cd_ibge" => 24],
            ["nome" => "Rio Grande do Sul",   "sigla" => "RS", "cd_ibge" => 43],
            ["nome" => "Rio de Janeiro",      "sigla" => "RJ", "cd_ibge" => 33],
            ["nome" => "Rondônia",            "sigla" => "RO", "cd_ibge" => 11],
            ["nome" => "Roraima",             "sigla" => "RR", "cd_ibge" => 14],
            ["nome" => "Santa Catarina",      "sigla" => "SC", "cd_ibge" => 42],
            ["nome" => "São Paulo",           "sigla" => "SP", "cd_ibge" => 35],
            ["nome" => "Sergipe",             "sigla" => "SE", "cd_ibge" => 28],
            ["nome" => "Tocantins",           "sigla" => "TO", "cd_ibge" => 17],
        ]);

        /**
         * MUNICIPIOS
         */
            $csvFile = fopen(base_path("database/data/municipios.csv"), "r");

            $firstline = true;

            $arr = [];

            while (($data = fgetcsv($csvFile, 200, ",")) !== FALSE) {

                if (!$firstline) {

                    $arr[] = [
                        "uf_id"   => $data[0],
                        "cd_ibge" => $data[1],
                        "nome"    => $data[2],
                    ];
                }

                $firstline = false;
            }

            DB::table('municipios')->insert($arr);

        fclose($csvFile);
    }
}

municipios.csv