"gaining independence" usually prescribes a "from" in the end of it, followed by the name of country/hegemon.
Historically (in Europe), I suppose first countries/nations got their independence with the collapse of Roman Empire, - more so the ones on the outskirts of Empire. So one may guess England and France, Balkan nations, as well as Middle East countries to be those among first ones to gain independence :)
It was France.
They gained increased economic independence by working in factories.
In 1973, Guinea-Bissau gained independence from Portugal.
they gained independence from the french in 1960.
white people
France
Texas gained Independence.
The country that Tanzania gained independence from in 1961 was Great Britain.
Portugal.
From Britain.
France
France
France
Ireland
It gained independence from Great Britain.
Kenya gained independence from Great Britain.
It was the year Texas gained it"s independence from Mexico