The successful production of oil in Katalla in 1911 proved?

1960's

Explanation:

it because in 1911 new oils were produced, in 1960, companies came to buy the newly produced oil for work in the cook let and production in oil, in 1968, the system became a joint venture between the British petroleum Atlantic Rich field and humble it was completed 1977 and it is an 800 mile pipeline that transport oil through pipelines Proudhon Bay south to Hickel Highway, across the Yukon and Livengood and Fairbanks

The truly first Alaskan oil well with commercial production was completed in 1902 in rugged, coastal territory where oil seeps had been known for years. Despite limited cable-tool technologies of the day, the Alaska Steam Coal & Petroleum Syndicate produced oil near the remote settlement of Katalla on Alaska's southern coast. That oilfield also led to construction of Alaska Territory's first refinery.