Why would a country with a one industry economy face possible issues when independent?

A country with one industry economy would  possibly face issues when independent because Then there wouldn't be a lot of manufactured goods, and products for them to export, not a lot of resources, and they won't be able to build up their economies properly,  and many people most likely wouldn't be able to get a job.Explanation:

baltic states. baltic states, northeastern region of europe containing the countries of estonia, latvia, and lithuania, on the eastern shores of the baltic sea.

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