Final answer:
BP got most of its oil from Iran, Iraq, and Kuwait during the 1930s to 70s, operating initially as the Anglo-Persian Oil Company and later expanding in the Middle East through partnerships and concessions.
Step-by-step explanation:
The three countries from which BP (British Petroleum) obtained most of its oil during the 1930's to 70's timeframe were Iran, Iraq, and Kuwait. Initially known as the Anglo-Persian Oil Company, BP was established to control oil production in Iran. The company's involvement in the Middle East expanded when areas such as Iraq came under British mandate, with companies such as the British-controlled multinational, TPC (Turkish Petroleum Company), being granted concessions. Kuwait's oil, too, became part of BP's portfolio through partnerships and concessions. Especially after the Second World War, the strategic importance of these regions' vast oil reserves became apparent and drove foreign interests and investments. However, the landscape of global oil production saw shifts with nationalization movements such as in Mexico and challenges posed by the formation and policies of the Organization of Petroleum Exporting Countries (OPEC).