Mexico's Senate has approved a measure to open the state-run oil fields to foreign investment for the first time in 75 years.
The measure would let private firms explore and extract oil and gas with state-run firm Pemex, and take a share of the profits.
It now moves to the lower house to be voted on, where it is expected to pass.
President Enrique Pena Nieto wrote on Twitter that it was "a significant decision for Mexico".
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