When did Bahrain gain independance?

Bahrain was occupied by several peoples throughout its history:

 

-One of the earlier nations expelled from power was Portugal, leaving after an 80 year rule, in 1602.

 

-Later the Persians, ruling for nearly 2 centuries, were expelled in 1783

 

-Most recently, the Bahraini people ended treaties and gained independance from the British in 1971.