Drop Table with Foreign Key constraint in SQL Server example

I have problem that

how i will Drop table having Constraint

one table have primary key and

another table contains both

primary & Foriegn

CREATE TABLE CountryMaster
(
	ID           int IDENTITY(1, 1) NOT NULL Primary Key,
	Name         nvarchar(50) NULL,
	CountryCode  varchar(5) NULL
	)

CREATE TABLE StateMaster(
	ID int IDENTITY(1,1) NOT NULL Primary Key,
	Name nvarchar(50) NULL,
	CountryID int NULL
)

 i want to delete these two tables