How did Sikkim become a part of India?

How did Sikkim become a part of India? when was sikkim state formed In the seventeenth century, the Namgyal dynasty formed the Kingdom of Sikkim The kingdom was made a protectorate of the British Empire in 1890 when was thriller released Transport Department ,Govt Of Sikkim NoticeNOTICE for Website SOP FOR VEHICLE LOCATION TRACKING SOP For VLTD with Apllication Forms

when i''m rich there will be signs meme Sikkim University was established in the city in 2007 Gangtok has government-maintained nurseries for cardamom—an important export from the state—and