The record is not being displayed from related table

Hi

I have two table Authors and Country. Country is the foreign key table of Author. When list authors , the corresponding country is not being showed. Please help in my sql

Country table
CountryId  CountryName 
  1          UK
  2          Australia
Authors
AuthorId    FirstName   LastName    CountryId 
 1            Thomas     Philiph       1
 2            John       Varghese      2

Model

public class Country
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int CountryId { get; set; }

        [Required]
        [MaxLength(50, ErrorMessage = "Country must be up to 50 characters in length")]
        public string CountryName { get; set; }
        [JsonIgnore]
        public virtual ICollection<Author> Authors { get; set; }
    }

public class Author
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int AuthorId { get; set; }

        [Required]
        [MaxLength(100, ErrorMessage ="First Name cannot be more than 100 characters")]
        public string FirstName { get; set; }

        [Required]
        [MaxLength(200, ErrorMessage = "Last Name cannot be more than 200 characters")]
        public string LastName { get; set; }

        [ForeignKey("CountryId")]
        public int CountryId { get; set; }
        public  Country Country { get; set; }
    }

Repository. When I try to list all the Authors with  their  country  details, the country  is being showed as null. How can I list the  related country records also with their details

public class AuthorRepository : IAuthorRepository
    {
        private BookStoreDbContext _db;

        public AuthorRepository(BookStoreDbContext db)
        {
            _db = db;
        }


	public ICollection<Author> GetAuthors()
        {var authorlist = _db.Authors.OrderBy(a => a.LastName).ToList(); // Country is not showed here
            return authorlist 
        }
}